During the depolarization phase of an action potential, the permeability of the membrane

A) to K+ is greatly increased.
B) to Na+ is greatly increased.
C) to Ca2+ is greatly increased.
D) is unchanged.


Answer: B) to Na+ is greatly increased.

Anatomy & Physiology

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Anatomy & Physiology

What ensures the one-way propagation of an action potential away from the initial site of activation?

a. The refractory period b. The activation period c. The rest period d. The salutatory period e. The electrical period

Anatomy & Physiology

The pyramids are __________ nerve tracts that are involved in the conscious control of __________.

A) ascending, smooth muscle B) ascending, skeletal muscle C) descending, smooth muscle D) descending, cardiac muscle E) descending, skeletal muscle

Anatomy & Physiology

The various chemical reactions that organisms carry out are collectively called

A. homeostasis. B. responsiveness. C. development. D. metabolism. E. reproduction.

Anatomy & Physiology