Which of the following physiological effects would likely occur first in a volunteer who was breathing air from which the CO2 was removed?
A. decreased blood pH
B. Decreased respirator rate
C. Increased respiratory rate
D. increase pulse rate
E. increase blood pressure
Ans: B. Decreased respirator rate
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Why don't corneal transplants (in the eye) provoke an immune response?
a. corneas are not cellular structures b. corneal cells secrete a chemical to trigger apoptosis in attacking lymphocytes c. lymphocytes recognize all corneas as "self" d. there are no lymphocytes in the eye e. corneal cells resemble lymphocytes
Arctic foxes typically have a white coat in the winter. In summer, when there is no snow on the ground, the foxes typically have a darker coat. Which of the following is most likely responsible for the seasonal change in coat color?
(A) The decrease in the amount of daylight in winter causes a change in gene expression, which results in the foxes growing a lighter- appearing coat. (B) The diet of the foxes in summer lacks a particular nutrient, which causes the foxes to lose their white coat and grow a darker- colored coat. (C) Competition for mates in the spring causes each fox to increase its camouflage with the environment by producing a darker- appearing coat. (D) The lower temperatures in winter denature the pigment molecules in the arctic fox coat, causing the coat to become lighter in color.
The amount of rest needed to recover from physical exertion is _______ related to the intensity of the work performed.
a. not b. inversely c. somewhat d. directly
Mycorrhizae are a:
A) mutualistic association between algae and plant roots. B) parasitic association between algae and fungi. C) mutualistic association between plant roots and a fungus. D) parasitic association between animals and fungi.