The term "homeostasis" refers to
A. stable external conditions.
B. stable internal conditions.
C. changing external conditions.
D. changing internal conditions.
Answer: B
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In tetrapods, the steroid hormone aldosterone plays a role in
A) Mineral balance. B) Water and vitamin balance. C) Mineral and vitamin balance. D) Water and mineral balance.
During fetal development the primary site(s) of red blood cell production is/are
A) bone marrow. B) liver. C) thymus. D) kidneys. E) liver and spleen.
When ACh binds to nicotinic receptors, it
A. always produces an excitatory response. B. always produces an inhibitory response. C. sometimes excites and sometimes inhibits the target cell depending on the subtype of receptor. D. sometimes excites and sometimes inhibits the target cell depending on the extracellular fluid surrounding the cell.
Identify the structure into which the major calices drain.
