Responses to heat stress include
a. reduction in muscle contraction.
b. increased sweating.
c. dilation of peripheral blood vessels.
d. loss of salts and liquids.
e. all of these.
Answer: e
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The greatest concentration of nitrogen on the planet Earth is found in:
a. living organisms, including bacteria b. the atmosphere c. soil minerals d. fossil fuels e. oceans
Which of the following is characteristic of cardiac muscle but not smooth muscle?
A. Ability of the cells to contract in a coordinated fashion B. Presence of gap junction cells C. Involuntary contraction D. Capability of responding to nervous stimulation E. Presence of intercalated disks
Hutton's theory of geological change included all EXCEPT
A. sudden extinction of species due to sudden, widespread disasters. B. extreme geological change occurring over a long period of time. C. production of layers of sediment through slow deposition. D. slow cycles of erosion and uplift.
Which of the following is a function of the cell cycle that involves mitosis in eukaryotes?
A. cell replacement B. sexual reproduction C. production of gametes D. speeding up evolution