Which of the following is considered to be homeostatic?
a. locomotion.
b. nerve conductance.
c. mammalian body temperature.
d. Two responses are homeostatic.
e. No responses are homeostatic.
e
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According to the leading proposal, parturition is initiated by
a. parasympathetic stimulation b. an increase in uterine responsiveness to oxytocin as a result of an increased concentration of myometrial oxytocin receptors c. a drop in oxytocin secretion d. a negative-feedback loop established between progesterone and oxytocin e. a rise in estrogen secretion
The term "periccardium" refers to:
A) the fibrous sac surrounding the heart B) the serous membrane lining the fibrous sac surrounding the heart C) the serous membrane covering the outer surface of the heart D) all of the above E) none of the above
Which of the following statements about blood is FALSE?
A) Blood helps maintain body temperature. B) Blood is more viscous than water. C) Blood performs immune functions. D) Blood pH normally falls between 6.5 and 6.8.
Which of the following structures represents the highest level of structural organization?
A) Cell B) Molecule C) Organelle D) Atom