1. Which of the following DOES NOT influence the conduction velocity of an actio
ID: 182770 • Letter: 1
Question
1. Which of the following DOES NOT influence the conduction velocity of an action potential
A)
Diameter of the axon
B)
Permeability of the axon
C)
Density of Ca channels
D)
Myelination (answer not D or A)
2. The relationship of an action potential (AP) to the stimulus that generates it is best described as:
A)
Stimulus intensity is correlated with the frequency of the AP
B)
Stimulus intensity is proportional to the amplitude of the AP
C)
Stimulus intensity is correlated with the length of the refractory period
D)
Stimulus intensity is proportional to the duration of the AP (answer not C)
A)
Diameter of the axon
B)
Permeability of the axon
C)
Density of Ca channels
D)
Myelination (answer not D or A)
Explanation / Answer
1. Option B is the correct answer
Explanation: Myelin sheath - This covers some of the nodes and acts as an electrical insulator where the action potential travels from one node of Ranvier to the next by saltatory conduction.
The diameter of the axon - the larger the diameter of an axon increases the rate and speed of conductance as there is less leakage of ions.
Temperature - The higher the temperature the faster the conductance. This is because enzymes work faster at a high temperature which controls the sodium-potassium pump needed to create action potentials.
2. Option A is correct
Explanation: Currents created by the gap of voltage-gated channels within the course of associate impulse are generally considerably larger than the initial stimulating current. Thus, the amplitude, duration, and form of the impulse are determined mostly by the properties of the excitable membrane and not the amplitude or length of the stimulant. This all-or-nothing property of the impulse sets it except for ranked potentials like receptor potentials, electrotonic potentials, and conjugation potentials, that scale with the magnitude of the stimulant.
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