Which of the following is a secondary sex organ?
A. Vagina
B. Testis
C. Ovary
D. Facial hair
E. Distribution of body fat
Answer: A
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During contraction of heart muscle cells ________
A) all of the calcium required for contraction comes from storage in the sarcoplasmic reticulum B) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores C) calcium is prevented from entering cardiac fibers that have been stimulated D) the action potential is prevented from spreading from cell to cell by gap junctions
Which animal has a greater volume of distribution?
a. a 7 percent dehydrated cat b. a normal cat
A rise in arterial PCO2 elevates carbon dioxide levels in cerebrospinal fluid and stimulates the chemoreceptive neurons of the medulla to produce __________.
a. eupnea b. a decrease in rate and depth of breathing c. hypercapnia d. an increase in rate and depth of breathing
Select how an erythrocyte's structure relates to its function.
a) The biconcave shape of RBC allows it to last for years without being damaged. b) RBC have large cytoplasmic spaces to store freely dissolved oxygen within. c) The biconcave shape allows flexibility to pass through capillaries and increase surface area. d) Multi-nucleated red blood cell allows it to provide enough energy to distribute oxygen throughout the body.