Which of the following most closely represents the percentage of water by weight in an
adult male?
A) 55% B) 65% C) 35% D) 45%
B
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T-lymphocytes in the thymus gland do not participate in the immune response and are protected from antigens by
A. the blood-thymus barrier. B. the low pH of the thymus gland. C. thymic macrophages. D. trabecular fibers. E. circulating B-lymphocytes.
Which muscle is seen on sectional images on either side of the rectum?
A. pectineus B. piriformis C. levator ani D. tensor
The influence of blood vessel diameter on peripheral resistance is ________.
A) the only factor that influences resistance B) significant because resistance is inversely proportional to the fourth power of the vessel radius C) significant because resistance is directly proportional to the blood vessel diameter D) insignificant because vessel diameter does not vary
How does the effector restore homeostasis in a negative feedback loop?
A) The effector causes a rapid change in a variable. B) The effector increases and reinforces the initial stimulus. C) The effector opposes the initial stimulus and shuts off when conditions return to the normal range. D) The effector amplifies the response, but does not continue indefinitely.