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.
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Epidural anesthesia is introduced to the epidural space between the __________ to block pain signals during pregnancy.
A. dural sheath and dura mater B. dural sheath and vertebral bones C. dura mater and arachnoid mater D. arachnoid mater and pia mater E. dura mater and pia mater
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
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
The various chemical reactions that organisms carry out are collectively called
A. homeostasis. B. responsiveness. C. development. D. metabolism. E. reproduction.