Once an Action Potential Occurs at the Axon Hillock, Why

question 15

Multiple Choice

 Once an action potential occurs at the axon hillock, why is it replicated at the next node of Ranvier?

• A) Incoming sodium ions diffuse to the next node, pushing potassium ions ahead as well, and threshold will be attained.
• B) The sodium-potassium pumps at the next node recapture sufficient potassium to reach threshold and trigger another action potential.
• C) The action potential drifts passively down the length of the entire axon.
• D) The occurrence of an action potential at the axon hillock attracts potassium from the adjacent node, and threshold will be attained.

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Definitions:

Biceps Brachii

A large muscle of the upper arm responsible for flexing the elbow and rotating the forearm, well known for its two heads or points of origin.

Serratus Anterior

A muscle located on the side of the chest that assists in the upward movement of the arm and in breathing.

Lateral Flexion

The bending of the neck or body toward the right or left side.

Posterior Neck Muscles

The group of muscles located at the back of the neck, including the trapezius and the splenius muscles, responsible for movements of the head and shoulders.