ATP and adenosine can act as neurotransmitters ________.
A. after being used for energy by the cell
B. when released by adrenergic neurons during sympathetic activation
C. when no ACh is available
D. All of the choices are correct.
Answer: B
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All of the following are true of the classical pathway of complement activation except one. Select the one answer that does not describe the classical pathway of complement activation
A) It is an example of overlap between innate and adaptive immune function. B) It requires that circulating antibodies are bound to antigens. C) Classical activation will result in enhanced inflammation, opsonization as well as formation of MAC proteins. D) It activates T-helper cells by presenting antigen to them.
What vitamin does parathyroid hormone enhance activation of in the kidneys?
a. vitamin A b. vitamin B6 c. vitamin C d. vitamin D e. vitamin E
When one hormone is needed for a second hormone to produce an effect, it is called
A) agonistic. B) antagonistic. C) synergistic. D) additive. E) permissive.
A body builder is doing curls, a type of arm exercise, with hand weights. In a curl, the body builder bends his arm and brins the weight closer to his or her shoulder. What type of movement is this?
A: rotation B: extension C: flexion D: abduction E: hyperextension