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Self-test questions: Chapter 07
Return to Human Physiology 5e - student resources
Self-test questions: Chapter 07
Quiz Content
*
not completed
.
The action potential of a nerve cell
results from a large increase in the membrane permeability to sodium ions
correct
incorrect
can summate one with another
correct
incorrect
may vary considerably in amplitude
correct
incorrect
becomes larger as stimulus strength increases
correct
incorrect
*
not completed
.
Which of the following statements about the speed of action potential propagation is correct?
It depends on the diameter of an axon
correct
incorrect
It depends on the thickness of the myelin around the axon
correct
incorrect
It is severely reduced if an axon becomes demyelinated
correct
incorrect
It is fastest in unmyelinated axons
correct
incorrect
*
not completed
.
If a motor nerve has a conduction velocity of 50 m s-1 how long will it take an action potential to reach a muscle 0.5 m from the spinal cord?
10 ms
correct
incorrect
15 ms
correct
incorrect
2 ms
correct
incorrect
20 ms
correct
incorrect
*
not completed
.
The amplitude of an action potential recorded from a nerve trunk is graded according to the stimulus strength.
True
correct
incorrect
False
correct
incorrect
*
not completed
.
The speed of action potential conduction is increased in demyelinating diseases such as Guillain�Barr� syndrome and multiple sclerosis.
True
correct
incorrect
False
correct
incorrect
*
not completed
.
Which of the following statements about synaptic excitation are correct?
The membrane potential of the post-synaptic cell hyperpolarizes
correct
incorrect
The epsps are all or none in nature
correct
incorrect
The epsps can summate
correct
incorrect
After an epsp the postsynaptic cell passes through a refractory period
correct
incorrect
*
not completed
.
At the neuromuscular junction:
the muscle membrane possesses nicotinic receptors
correct
incorrect
the motor nerve endings secrete norepinephrine
correct
incorrect
neuromuscular transmission is enhanced by curare
correct
incorrect
the motor nerve endings secrete acetylcholine
correct
incorrect
*
not completed
.
The axons of peripheral nerves:
are always covered by a layer of myelin
correct
incorrect
are always associated with Schwann cells
correct
incorrect
only conduct action potentials from the CNS to a target organ
correct
incorrect
are protected by three layers of connective tissue
correct
incorrect
*
not completed
.
Nerve terminals may contain more than one kind of neurotransmitter
True
correct
incorrect
False
correct
incorrect
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