How can we help?

You can also find more resources in our Help Center.

Study sets matching "saltatory conduction"

Study sets
Classes
Users

Study sets matching "saltatory conduction"

37 terms
Saltatory Conduction
The two types of nerve fibers in a ner…
Myelinated fibers control ___ body mov…
Unmyelinated fibers control ___ body m…
Unmyelinated fibers cannot conduct ___…
myelinated and unmyelinated
rapid
slow
rapid
The two types of nerve fibers in a ner…
myelinated and unmyelinated
Myelinated fibers control ___ body mov…
rapid
37 terms
Saltatory Conduction
The two types of nerve fibers in a ner…
Myelinated fibers control ___ body mov…
Unmyelinated fibers control ___ body m…
Unmyelinated fibers cannot conduct ___…
myelinated and unmyelinated
rapid
slow
rapid
The two types of nerve fibers in a ner…
myelinated and unmyelinated
Myelinated fibers control ___ body mov…
rapid
5 terms
Saltatory conduction
Saltatory conduction
In a myelinated axon?
At each node of ranvier?
Increases the speed of?
Energy from one end to the other without losing strength
The electrical charge is passively conducted down the axon be…
Sodium enters and the membrane depolarized
Transmission
Saltatory conduction
Energy from one end to the other without losing strength
In a myelinated axon?
The electrical charge is passively conducted down the axon be…
Saltatory Conduction
What are the 2 types of signal that ar…
Where do electrical signals occur?
Where do chemical signals occur?
Does the current produced at a dendrit…
Electrical ... Chemical
This occurs within neurones
This occurs between neurons
yes
What are the 2 types of signal that ar…
Electrical ... Chemical
Where do electrical signals occur?
This occurs within neurones
5 terms
R. Continuous and saltatory conduction
Continuous conduction
Step by step depolarization
Saltatory
Depolarization
Unmyelinated fibers
Each portion of the length of the axolemma
Another condition
Only at nodes or fancier where there is a high density of vol…
Continuous conduction
Unmyelinated fibers
Step by step depolarization
Each portion of the length of the axolemma
7 terms
A&P Saltatory Conduction
an action potential at a __ __ __ gene…
When the __ caused by the local curren…
Action potential propagation is rapid…
speed of conduction is faster in __ th…
node of Ranvier, node of Ranvier, Schwann
depolarization, node of Ranvier,
nodes of Ranvier
myelinated, non-myelinated
an action potential at a __ __ __ gene…
node of Ranvier, node of Ranvier, Schwann
When the __ caused by the local curren…
depolarization, node of Ranvier,
14 terms
Continuous and Saltatory Conduction
What are the two types of propagation?
What is continuous conduction?
In continuous conduction, how do ions…
Where does continuous conduction occur?
continuous conduction, and saltatory conduction
the step-by-step depolarization and repolarization of each ad…
through their voltage-gated channels in each adjacent segment…
in unmyelinated axons and in muscle fibers
What are the two types of propagation?
continuous conduction, and saltatory conduction
What is continuous conduction?
the step-by-step depolarization and repolarization of each ad…
14 terms
Continuous and Saltatory Conduction
What are the two types of propagation?
What is continuous conduction?
In continuous conduction, how do ions…
Where does continuous conduction occur?
continuous conduction, and saltatory conduction
the step-by-step depolarization and repolarization of each ad…
through their voltage-gated channels in each adjacent segment…
in unmyelinated axons and in muscle fibers
What are the two types of propagation?
continuous conduction, and saltatory conduction
What is continuous conduction?
the step-by-step depolarization and repolarization of each ad…
12 terms
Saltatory Conduction - Myelinated Axon
Why myelination?
Effects of myelination at internodes
Effect of increase in membrane capacit…
Saltatory conduction
There is not enough space in the body to increase the conduct…
Increase in membrane resistance... Increase in length constant,…
Less current needed to charge capacitor and more can enter ax…
depolarizing current is redirected from node to node
Why myelination?
There is not enough space in the body to increase the conduct…
Effects of myelination at internodes
Increase in membrane resistance... Increase in length constant,…
7 terms
SWAC A&P Saltatory Conduction
an action potential at a __ __ __ gene…
When the __ caused by the local curren…
Action potential propagation is rapid…
speed of conduction is faster in __ th…
node of Ranvier, node of Ranvier, Schwann
depolarization, node of Ranvier,
nodes of Ranvier
myelinated, non-myelinated
an action potential at a __ __ __ gene…
node of Ranvier, node of Ranvier, Schwann
When the __ caused by the local curren…
depolarization, node of Ranvier,
14 terms
Continuous and Saltatory Conduction
What are the two types of propagation?
What is continuous conduction?
In continuous conduction, how do ions…
Where does continuous conduction occur?
continuous conduction, and saltatory conduction
the step-by-step depolarization and repolarization of each ad…
through their voltage-gated channels in each adjacent segment…
in unmyelinated axons and in muscle fibers
What are the two types of propagation?
continuous conduction, and saltatory conduction
What is continuous conduction?
the step-by-step depolarization and repolarization of each ad…
13 terms
CH. 4, contiguous Conduction vs. Saltatory Conduction
contiguous
unmyelinated
saltatory
myelinated
__ conduction is continuous, where one action potential trigg…
contiguous conduction occurs in ___ fibers
___ conduction, the impulse "jumps" from node to node, skippi…
salutatory conduction occurs in ___ fibers (a thick layer cov…
contiguous
__ conduction is continuous, where one action potential trigg…
unmyelinated
contiguous conduction occurs in ___ fibers
29 terms
Action Potential: propagation, conduction velocity, saltatory conduction
When does the potential difference ins…
During an AP, what happens to adjacent…
At the active site, how do the charges…
3 steps of propagation:
when the initial segment of axon has fired an AP (@ axon hill…
adjacent areas are inactive & remain at RMP (so the inside is…
+++ charges inside the nerve flow to adjacent inactive area.
1) @ initial segment of axon: AP fires, inside of CM becomes…
When does the potential difference ins…
when the initial segment of axon has fired an AP (@ axon hill…
During an AP, what happens to adjacent…
adjacent areas are inactive & remain at RMP (so the inside is…
44 terms
Continuous, Saltatory Conduction, Synapse, and impulse propagation
Continuous conduction is on _______ fi…
continuous conduction is a ______ depo…
Saltatory conduction - depolarization…
in saltatory conduction, current carri…
unmyelinated
1. step by step... 2. axolemma
1. nodes of ran vier... 2. high
1. ions... 2.extracellular fluid... 3. action potential
Continuous conduction is on _______ fi…
unmyelinated
continuous conduction is a ______ depo…
1. step by step... 2. axolemma
34 terms
13: propagation (spreading) of action potentials & saltatory conduction
what is a nerve impulse
how is a wave of depolarisation initia…
once Na+ ions are inside the axon,
1st step of action potential propagati…
an ACTION POTENTIAL that starts @ *1 end of neurone & is prop…
INTIAL STIMULUS changes sensory receptor which triggers *ac…
they are attracted by the - charge ahead & conc grad & so D…
RESTING POTENTIAL/ POLARISED:... higher conc of *Na+ ions OUTSID…
what is a nerve impulse
an ACTION POTENTIAL that starts @ *1 end of neurone & is prop…
how is a wave of depolarisation initia…
INTIAL STIMULUS changes sensory receptor which triggers *ac…
50 terms
Biopsychology Action potentials + saltatory conduction + synaptic transmission
By acting as an electrical insulator
Myelination of axons in the CNS
myelination of axons in the PNS
saltatory conduction is faster
Myelin speeds up action potential
oligodendrocytes
Schwann cells
because of nodes of ranvier
By acting as an electrical insulator
Myelin speeds up action potential
Myelination of axons in the CNS
oligodendrocytes
8 terms
4) NERVOUS TISSUE (saltatory vs continuous conduction)
2 types of nerve impulse conduction
location voltage-gated channels in mye…
speed of saltatory conduction
speed of continuous conduction
continuous & saltatory
concentrated almost exclusively @ nodes of ranvier... Under myel…
faster
slower
2 types of nerve impulse conduction
continuous & saltatory
location voltage-gated channels in mye…
concentrated almost exclusively @ nodes of ranvier... Under myel…
24 terms
saltatory conduction and 'all or nothing' principle
what do myelinated axons do faster in…
where can depolarisation of axon membr…
what happens at nodes of ranvier durin…
what occurs as a result of sodium ions…
myelinated axons transferplectrical impulses much faster than…
depolarisation of only occur at nodes of ranvier where no mye…
-sodium ions pass through protein channels in the membrane
longer localised circuits arise between adjacent nodes of Ran…
what do myelinated axons do faster in…
myelinated axons transferplectrical impulses much faster than…
where can depolarisation of axon membr…
depolarisation of only occur at nodes of ranvier where no mye…
69 terms
Neuro Set 2 (Cerebral Blood Flow, Saltatory conduction)
Nerve cells are apoximately _________%…
What color are nerve cells?
How do nerve cells transmit signals?
Nerve cells transmit signals in ______…
10% (or 50%)
grey
electrically
one
Nerve cells are apoximately _________%…
10% (or 50%)
What color are nerve cells?
grey
9 terms
Anatomy & Physiology: Nerve Conduction & Muscle Contraction
Neuron
Soma or Body
Dendrite
Axon
Identify the cell.
Identify B. Contains the nucleus.
Identify. Receive incoming stimuli.
Identify. Moves impulses away from cell body.
Neuron
Identify the cell.
Soma or Body
Identify B. Contains the nucleus.
9 terms
Anatomy & Physiology: Nerve Conduction & Muscle Contraction
Neuron
Soma or Body
Dendrite
Axon
Identify the cell.
Identify B. Contains the nucleus.
Identify. Receive incoming stimuli.
Identify. Moves impulses away from cell body.
Neuron
Identify the cell.
Soma or Body
Identify B. Contains the nucleus.
10 terms
Nerve Conduction & Muscle Contraction
Neuron
Soma or Body
Dendrite
Axon
Identify the cell.
Identify B. Contains the nucleus.
Identify. Receive incoming stimuli.
Identify. Moves impulses away from cell body.
Neuron
Identify the cell.
Soma or Body
Identify B. Contains the nucleus.
27 terms
Continuous vs saltatory
Continuous is held on what type of fib…
what type of depolarization is continu…
Where is depolarization held at saltat…
In saltatory conduction how are curren…
unmyelinated.
step by step of each portion of the length of the axolemma
only at the nodes of ranvier where there is a high density of…
by ion flow through extracellular fluid from node to node. Ac…
Continuous is held on what type of fib…
unmyelinated.
what type of depolarization is continu…
step by step of each portion of the length of the axolemma
8 terms
Conduction of Action potentials
Continuous conduction
Saltatory conduction
Tansmission at the synapses
Electrical synapses
This is a step by step depolarization of adjacent areas of th…
This is the conduction in myelinated axons. In this conductio…
In order for the impulse to travel throughout the nervous sys…
Ion current spread directly form one cell to another via gap…
Continuous conduction
This is a step by step depolarization of adjacent areas of th…
Saltatory conduction
This is the conduction in myelinated axons. In this conductio…
25 terms
Neural Conduction
Membrane Potential
Resting Potential
Na+ and K+
Ion Channel Proteins
Difference in electric charge b/w the inside and outside of a…
-70mV; polarized neuron
In resting neurons... More Na+ outside than inside... More K+ insid…
Specialized for the passage of Na+ or K+ in/out of the cell
Membrane Potential
Difference in electric charge b/w the inside and outside of a…
Resting Potential
-70mV; polarized neuron
22 terms
nervous conduction
EPSP (Excitatory post synaptic potenti…
IPSP (inhibitory post synaptic potenti…
continuous conduction
saltatory conduction
specific type of graded potential... arise from summation of ind…
graded potential that results in a deviation away from thresh…
occurs on an unmyelinated axon ... need Na+/K+ pumps... in PNS, sch…
"leap"... occurs on myelinated axons... AP "leaps over myelin"... schw…
EPSP (Excitatory post synaptic potenti…
specific type of graded potential... arise from summation of ind…
IPSP (inhibitory post synaptic potenti…
graded potential that results in a deviation away from thresh…
61 terms
Neural Conduction
Membrane Potential
Resting Potential
Na+ and K+
Ion Channel Proteins
Difference in electric charge b/w the inside and outside of a…
-70mV; polarized neuron
In resting neurons... More Na+ outside than inside... More K+ insid…
Specialized for the passage of Na+ or K+ in/out of the cell
Membrane Potential
Difference in electric charge b/w the inside and outside of a…
Resting Potential
-70mV; polarized neuron
20 terms
Conduction
Conduction
Saltatory conduction
Continuous conduction
Conduction factors
Nerve impulse travel along axon
Jumps quickly from one segment to the next occurs on myelinat…
Slight slower through unmyelinated axons
Myelention and diameter
Conduction
Nerve impulse travel along axon
Saltatory conduction
Jumps quickly from one segment to the next occurs on myelinat…
13 terms
Lecture 4 - Neural Conduction and Synaptic Transmission
Chemical events at synapse
Release of Neurotransmitter (NT) Molec…
Resting Membrane Potential
Ions Contributing to Resting Potential
• Exocytosis - the process of NT release... • The arrival of an…
• Recording the membrane potential: difference in electrical…
1. Sodium (Na+) ... 2. Chloride (Cl-)... 3. Potassium (K+)... 4. Negat…
Chemical events at synapse
Release of Neurotransmitter (NT) Molec…
• Exocytosis - the process of NT release... • The arrival of an…
Biopsychology Chapter 4 Part 1- Neural Conduction
Resting Membrane Potential
Forces and Factors for Resting Membran…
Ions Inside and Outside the Cell
Diffusion
The source of energy. Difference in concentration of charged…
1. Diffusion of ions down concentration gradient(Na+ wants to…
Outside(mostly): Na+, Cl-... Inside(mostly): Protein-/A-, K+
Tendencey of ions in solution to be in constant random motion…
Resting Membrane Potential
The source of energy. Difference in concentration of charged…
Forces and Factors for Resting Membran…
1. Diffusion of ions down concentration gradient(Na+ wants to…
Conduction of Nerve Impulses
2 types of conduction
Continuous Conduction
Saltatory Conduction
How Saltatory Conduction uses voltage…
1. continuous conduction... 2. saltatory conduction
occurs over unmyelinated axons, is a step-by-step depolarizin…
occurs over myelinated axons, very fast, appears to leap from…
the nerve impulse appears to leap from node to node because o…
2 types of conduction
1. continuous conduction... 2. saltatory conduction
Continuous Conduction
occurs over unmyelinated axons, is a step-by-step depolarizin…
22 terms
Generation and Conduction of Action Potentials
Action Potential Characteristics
Local Potential (Sub-Threshold Response)
Action Potential (Threshold)
Ionic Mechanism of Action Potential
1. Restricted to "excitable" cells (neurons, muscles, some gl…
-Resting potential altered by current injection... i. Hyperpola…
-Minimal effective intensity... -Superthreshold stimulation elic…
-Resting PD described by GHK equation... -Action potential resul…
Action Potential Characteristics
1. Restricted to "excitable" cells (neurons, muscles, some gl…
Local Potential (Sub-Threshold Response)
-Resting potential altered by current injection... i. Hyperpola…
40 terms
Lecture 8: AP conduction and Synapse (neural communication)
Long
All or None
constant
Graded Potential
-Action Potentials travel ________________ distances.
-What type of response is an Action Potential?
-Actions Potentials have a wave of electrical signal at _____…
-This type of potential varies in strength.
Long
-Action Potentials travel ________________ distances.
All or None
-What type of response is an Action Potential?
20 terms
action potential genesis & conduction ***
action potential
definition of action potential
AP initiators
graded potentials
- be able to sketch... - know approx. values for resting potenti…
- stereotyped : rise and fall usually have approximately the…
- Deformation - stretch (touch receptor)... - Temperature. ... - Li…
- used in initiation of AP... - depolarizations or hyperpolariza…
action potential
- be able to sketch... - know approx. values for resting potenti…
definition of action potential
- stereotyped : rise and fall usually have approximately the…
10 terms
Physiology of nerve conduction
Membrane potential
Electrochemical gradient
Action potential
Depolarizing
An electrical potential difference (voltage) across the membr…
Ions move across membrane down gradient. More sodium outside,…
Two phases depolarizing and repolarizing.
Neg membrane potential becomes positive.
Membrane potential
An electrical potential difference (voltage) across the membr…
Electrochemical gradient
Ions move across membrane down gradient. More sodium outside,…
111 terms
Chapter 4- Neural Conduction and Synaptic Transmission
substantia nigra
dopamine
striatum
control movement ... this make sense ..…
a small group of nerve cells in a patient that has parkinson;…
the neurons of the substantia nigra make the neurotransmitter
they deliver the dopamine to another part of the body called…
the striatum helps do what
substantia nigra
a small group of nerve cells in a patient that has parkinson;…
dopamine
the neurons of the substantia nigra make the neurotransmitter
22 terms
Nerve Conduction
Response to stimuli
Structure of the Neuron
Excitatory postsynaptic potential
Inhibitory postsynaptic potential
-Add hyperpolarizing current: takes time for membrane to reac…
-Dendrites: Beginning of a neuron that receives information f…
EPSP... -Postsynaptic potential that makes a postsynaptic neur…
IPSP... -Synaptic potential that make a postsynaptic neuron LE…
Response to stimuli
-Add hyperpolarizing current: takes time for membrane to reac…
Structure of the Neuron
-Dendrites: Beginning of a neuron that receives information f…
11 terms
Lecture 5: Neural Conduction and Synaptic Transmission
exocytosis
What initiates exocytosis
Neuron at rest
Ion channel 1: Ligand-gated
A process of neurotransmitter release
- The arrival of an action potential at the terminal opens vo…
- Inside of the neuron is negative with respect to the outsid…
Opens only if correct neurotransmitter binds to it (like a lo…
exocytosis
A process of neurotransmitter release
What initiates exocytosis
- The arrival of an action potential at the terminal opens vo…
29 terms
Nerve Conduction and Neurotransmission
Signal along brain circuits (2 Steps)
Neuron structure
Every ion has an Equilibrium Concentra…
Nernst Equation
1.) Nerve Impulse Conduction- passage of electrical signal al…
Dendrite- inc. SA of cell body; covered in synapses (tiny pro…
The relative conc. of the ion between the two compartments, a…
Ex = (60/z)log([X out]/[X in])... Ex- voltage in mV... z- ion charg…
Signal along brain circuits (2 Steps)
1.) Nerve Impulse Conduction- passage of electrical signal al…
Neuron structure
Dendrite- inc. SA of cell body; covered in synapses (tiny pro…
11 terms
stimulus/ impulse conduction
„ A change in the internal or external…
- Too weak to initiate an impulse (AP)
- neuron fires completely or not at al…
- Strong enough to initiate an impulse…
Stimulus
Subthreshold
all-or-none phenomenon
Threshold (liminal) stimulus
„ A change in the internal or external…
Stimulus
- Too weak to initiate an impulse (AP)
Subthreshold
8 terms
Impulse Conduction
Continuous conduction
Saltatory conduction
Continuous conduction
Saltatory conduction
*SEE NOTES (pg. 28)... - Unmyelinated, gray matter of CNS, assoc…
*SEE NOTES (pg. 29)... - Myelinated, white matter of PNS, sensor…
*SEE NOTES (pg. 30)
*SEE NOTES (pg. 30)
Continuous conduction
*SEE NOTES (pg. 28)... - Unmyelinated, gray matter of CNS, assoc…
Saltatory conduction
*SEE NOTES (pg. 29)... - Myelinated, white matter of PNS, sensor…
29 terms
Anatomy & Physiology: Nerve Conduction & Muscle Contraction
Neuron
Soma or Body
Dendrite
Axon
Identify the cell.
Identify B. Contains the nucleus.
Identify. Receive incoming stimuli.
Identify. Moves impulses away from cell body.
Neuron
Identify the cell.
Soma or Body
Identify B. Contains the nucleus.
28 terms
Process of Impulse Conduction
Impulse Conduction
Electrical
Electrical Impulse Conduction
Resting Membrane Potential
Basic form of sending information in the nervous system. Made…
Nerve impulse travels down axon and down axon terminals becau…
Resting Membrane Potential, Stimulus (Impulse), Critical Thre…
Before impulse can fire, state of readiness is needed (R.M.P)…
Impulse Conduction
Basic form of sending information in the nervous system. Made…
Electrical
Nerve impulse travels down axon and down axon terminals becau…
7 terms
Axonal Conduction
Cable Conduction
What are the Constants in Axonal Condu…
Conduction Speed Factors
Conduction in Myelinated Axon
what is happening in an axon that doesn't have myelin around…
1. Time constant... 2. Space constant
-thicker core of axon, stronger and faster the signal
270mph depending on axonal thickness
Cable Conduction
what is happening in an axon that doesn't have myelin around…
What are the Constants in Axonal Condu…
1. Time constant... 2. Space constant
29 terms
Anatomy & Physiology: Nerve Conduction & Muscle Contraction
Neuron
Soma or Body
Dendrite
Axon
Identify the cell.
Identify B. Contains the nucleus.
Identify. Receive incoming stimuli.
Identify. Moves impulses away from cell body.
Neuron
Identify the cell.
Soma or Body
Identify B. Contains the nucleus.
48 terms
Action Potential Conduction w/ NT Drugs
Orthodromic Conduction
Antidromic Conduction
Increase conduction velocity of AP
Saltatory conduction
Movement of an AP towards the axon (400-500 pulses/sec)
Movement of AP towards cell body (prevented by absolute refra…
Increase diameter of the axon... Insulate the axon
Jumping from node to node
Orthodromic Conduction
Movement of an AP towards the axon (400-500 pulses/sec)
Antidromic Conduction
Movement of AP towards cell body (prevented by absolute refra…
17 terms
Action Potential and Impulse Conduction
Put the steps of a nerve impulse condu…
Action potential
Depolarization
Repolarization
1. neuron membrane maintains a resting potential... 2. threshold…
sequence of electrical changes in the axon of a neuron when e…
when a membrane potential becomes LESS negative
when a membrane becomes MORE negative
Put the steps of a nerve impulse condu…
1. neuron membrane maintains a resting potential... 2. threshold…
Action potential
sequence of electrical changes in the axon of a neuron when e…
25 terms
Action potential initiation and conduction
At the axon hillock.
Near the sensory endings.
The central region of the muscle that…
Opening of the voltage-gated Na+ chann…
In multipolar neurons where is the action potential initiatio…
In bipolar and pseudounipolar neurons where is the action pot…
In skeletal muscle fibers where is the impulse initiation zone?
What producing the rising phase of the action potential?
At the axon hillock.
In multipolar neurons where is the action potential initiatio…
Near the sensory endings.
In bipolar and pseudounipolar neurons where is the action pot…
26 terms
Signal Conduction Along Nerves
information is carried by nerves in th…
Two forms of electrical signals
Graded Response
Action potential
an electrical current
-graded response... -action potential
-occurs at sensory receptor endings and dendrites on unipolar…
-doesn't occur without graded response... - generated by excitab…
information is carried by nerves in th…
an electrical current
Two forms of electrical signals
-graded response... -action potential
22 terms
A&P I Chp. 12 - Propagation(conduction) of AP/Impulse
initial segment, axon
1, backwards
continuous conduction, saltatory condu…
unmyelinated
the propagation of an action potential starts at the --------…
AP/impulse always travel in ---- direction, never --------
2 types of propagation(conduction) of AP
Continuous conduction occurs in --------- axon
initial segment, axon
the propagation of an action potential starts at the --------…
1, backwards
AP/impulse always travel in ---- direction, never --------
1 of 10