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Human Physiology: Chapter 8 (Test 2)
Terms in this set (60)
The central nervous system is composed of what?
Brain and spinal cord
What brings signals to the CNS and carry signals away from the CNS?
Impulses arrive to the CNS by what kind of neurons?
Impulses leave the CNS by what kind of neurons?
What is a communicating cell of nervous tissue?
Organization of a cell in the nervous system...
dendrites, cell body, axon, myelin coat, terminal
What part of a nerve cell connects to the cell body to the terminal?
All structures in the nervous system are surrounded by a continuous...
When it comes to the nerve cell, the function of the dendrites are...
receives input signal
When it comes to the nerve cell, the function of the cell body is to...
it integrates the signal
When it comes to the nerve cell, the function of the axon is...
transmits output signal
When it comes to the nerve cell, the function of the terminal is...
the site of neurotransmitter secretion
When neurons are communicating, which neuron SENDS the signal?
When neurons are communicating, which neuron RECEIVES the signal?
Site of communication from neuron to neuron in the nervous system is...
The synapse joins...
presynaptic axon terminal and postsynaptic dendrite
What is a cleft?
Fluid filled space at junction between the presynaptic axon terminal and the postsynaptic dendrite
When it comes to the presynaptic function, the cell body...
determines when to fire impulse
When it comes to the presynaptic function, the axon hillock...
is the impulse initiation site
When it comes to presynaptic function, the axon...
transmits impulse to terminal
When it comes to presynaptic function, the axon terminal...
releases the NT
When it comes to the postsynaptic function, the receptors on membrane of dendrite...
bind to NT and initiate response
When it comes to the postsynaptic function, the cell body...
intergrates incoming signals
Of the neuronal tissue cell types, the neuron...
is the electrical signaling
Of the neuronal tissue cell types, the glial...
supports and is the stem cell source
What is known as the CNS myelin?
What is known as the PNS myelin?
Depolarizations in the cell body is known as...
Depolarizations in the axon is known as...
action potential (impulse)
With graded potential, is it self-sustaining or not self-sustaining?
Not self-sustaining, disappears as it spreads
With action potential, is it self-sustaining or not self-sustaining?
Self-sustaining, it regenerates as it spreads (propagates)
With graded potential, the intensity declines from...
dendrite through body cell
With action potential, the intensity constant is from...
the hillock to terminal
What does graded potential require?
Receptor operated Na+ channels
The part of the cell that has graded potential is...
the cell body
Which initiates graded potential?
Opening receptor operated Na+ channels in the postsynaptic membrane
An EPSP is what...
a membrane depolarization due to increased Na+ permeability
An inhibitory signal does what to the postsynaptic membrane of a target cell?
Produces a hyperpolarization
What is an example of hyper polarization of the postsynaptic membrane?
What are special channels found only in the axon of the neuron?
voltage dependent Na+ and K+ channels
What is responsible for the rapid depolarization of the membrane during and action potential?
opening of voltage dependent Na+channels
Opening receptor operated Na+ channels of the postsynaptic membrane does what?
Depolarizes the post synaptic membrane
Characteristics of the postsynaptic membrane...
-located in the synapse
-becomes depolarized by opening receptor operated Na+ channels
-initiates graded membrane potential
-has receptors for neurotransmitter
Characteristics of graded potentials...
-spreads away from sites of receptor operated channels
-depolarization declines with distance form source
-initiated in dendrites
During the action potential, increased K+ permeability accounts for...
repolarization of the membrane
What decreases the depolarization of a graded potential?
distance from the location of initial depolarization
What increases the conduction rate of action potentials?
What increases the amount of neurotransmitter released from the nerve terminal?
a greater frequency of action potentials
A neuron that receives a larger intensity stimulus will respond by which of the following?
increase the frequency of action potentials
To increase the intensity of a signal transmitted to a postsynaptic neuron, a presynaptic neuron will do what?
release more neurotransmitter into the synapse
A postsynaptic neuron which receives signals from multiple stimulatory and inhibitory presynaptic neurons is an example of...
Characteristics of presynaptic membrane
-located in the synapse
-may contribute to termination
-may have transporters for removing unbound neurotransmitter from the synapse
-terminal location of action potential
Characteristics of action potentials
-initiated in axon hillock
-are always equal to amp and duration
-travel in one direction
With Na+ inactivation, the membrane...
When membrane potential rises above 0 mV...
voltage sensitive K+ channels open
When membrane potential reaches threshold...
voltage sensitive Na+ channels open
When a membrane hyper polarizes...
new action potential prevented
When voltage sensitive K+ channels open
When voltage sensitive Na+ channels open...
When K+ channels slowly close...
THIS SET IS OFTEN IN FOLDERS WITH...
Human Physiology: Chapter 1
Human Physiology: Chapter 2
Human Physiology: Chapter 3
Human Physiology: Chapter 4
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