Study sets matching "saltatory conduction"

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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
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
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,
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…
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,…
6 terms
Myelin and Saltatory Conduction
What is made of multiple layers of pho…
Myelin is created by which cells?
Schwann cells grow around the axon mak…
There are gaps along the axon between…
Myelin is multiple layers of phospholipid bilayer that insula…
Myelin is created by Schwann cells.
Schwann cells grow around the axon making up to 20+ layers.
There are gaps along the axon between Schwann cells called no…
What is made of multiple layers of pho…
Myelin is multiple layers of phospholipid bilayer that insula…
Myelin is created by which cells?
Myelin is created by Schwann cells.
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,
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
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
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…
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
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…
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.
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.
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
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.
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…
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…
AP Conduction
ap conduction
2 types of ap conduction
continous conduction
saltatory conduction
impulse moves via a wave of depolarization
continous, saltatory
Depolarization of one portion of the membrane causes depolari…
Depolarization of one node of Ranvier causes depolarization o…
ap conduction
impulse moves via a wave of depolarization
2 types of ap conduction
continous, saltatory
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
5 terms
Conduction Speed
Conduction speed
2 Main factors of Conduction speed
Saltatory Conduction
Continuous conduction
Rate of AP propagation; determines how quickly signaling can…
Diameter of the Axon: Large is faster due to less resistance,…
Myelin sheath is present, acts as an insulator; AP "jumps" fr…
Myelin sheath is absent; must travel the entire surface of ax…
Conduction speed
Rate of AP propagation; determines how quickly signaling can…
2 Main factors of Conduction speed
Diameter of the Axon: Large is faster due to less resistance,…
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…
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…
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…
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…
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?
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…
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
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
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…
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
Chap. 12 Refractory, Saltatory, and Neurotransmitters
What is the refractory period ?
In which phase of refractory is no sti…
In which phase o refractory is it poss…
What is it when conduction in myelinat…
When the neuron cannot be stimulated during and shortly after…
Absolute
Relative
Saltatory conduction
What is the refractory period ?
When the neuron cannot be stimulated during and shortly after…
In which phase of refractory is no sti…
Absolute
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,…
neural conduction
resting membrane potential
diffusion
electrostatic pressure
hyperpolarized
-70mv... *energy for action potentials
move down the concentration gradient
opposites attract & likes repel
increase resting membrane potential
resting membrane potential
-70mv... *energy for action potentials
diffusion
move down the concentration gradient
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
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…
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…
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.
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…
32 terms
Nerve Conduction
Characteristics of a neuron
resting membrane potential
resting membrane potential chemical di…
sodium potassium pump
-ability to generate and conduct an impulse... -limited ablilit…
-the electrical difference between the inside of the neuron a…
-the membrane has a 50-100 times greater permiability to K+ t…
-needs ATP to run... -located in the plasma membrane... -transpor…
Characteristics of a neuron
-ability to generate and conduct an impulse... -limited ablilit…
resting membrane potential
-the electrical difference between the inside of the neuron a…
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
23 terms
Nerve conduction
Nerve conduction
Nerve conduction
Nerve conduction
Nerve conduction
1 - graded potential develops in sensory receptor ... 2 - grade…
4 - neuro T stimulates interneuron, forms graded potential in…
6 - graded potential cause neuro t release over andover 2 cer…
8 - new road tst me later muscle from an action potential mus…
Nerve conduction
1 - graded potential develops in sensory receptor ... 2 - grade…
Nerve conduction
4 - neuro T stimulates interneuron, forms graded potential in…
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