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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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 parasympathetic autonomic responses associated with defecation and urination are processed and controlled at the level of the
A. spinal cord. B. cerebellum. C. brainstem. D. limbic center. E. hypothalamus.
A small family was traveling in its van and had a minor accident. The children in the back seats were wearing lap belts, but still sustained numerous bruises about the abdomen, and had some internal organ injuries
Why is this area more vulnerable to damage than others?
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