Presynaptic facilitation occurs when
A) calcium channels in the presynaptic membrane are inhibited.
B) temporal summation occurs.
C) calcium channels in the presynaptic membrane remain open longer.
D) extracellular concentration of potassium increases.
E) extracellular concentration of sodium increases.
C) calcium channels in the presynaptic membrane remain open longer.
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Why is this area more vulnerable to damage than others?
The ear-shaped surface where the sacrum articulates with the os coxae is the ________ surface.
Fill in the blank(s) with the appropriate word(s).
The type of bone that is composed of small columns of bone loosely arranged in a grid-work pattern is known as ____ bone.
a. trabecular b. spongy c. soft d. compact
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