Salt balance in humans
a. depends primarily upon control of Na+ intake through salt hunger
b. depends primarily upon control of Na+ output by the kidneys
c. is poorly regulated
d. depends upon Na+ secretion by the kidneys
e. is not affected by aldosterone secretion
B
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Fill in the blank(s) with the appropriate word(s).
Smoking exposes the nervous system to nicotine contained in cigarettes. Smokers experience a "buzz" from the nicotine, as it activates nicotinic receptors of ________ neurons.
A. muscarinic B. cholinergic C. adrenergic D. multipolar
State two ways in which endocrine glands and exocrine glands differ.
What will be an ideal response?
Lymphocyte proliferation begins by increasing the number of ________.
A. T suppressor cells B. macrophages C. cytotoxic T cells D. B cells E. helper T cells