Muscle fatigue is a result of
a. accumulation of lactic acid.
b. exhaustion of available ATP.
c. reduction in lactic acid.
d. failure of calcium channels to open after prolonged use.
e. inactivity of muscles for prolonged periods of time.
A
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Acetylcholine ____ skeletal muscle and ____ cardiac muscle
a. stimulates; also stimulates b. stimulates; inhibits c. inhibits; stimulates d. inhibits; also inhibits e. binds receptors on; does not bind receptors on
Type 1 diabetes results from lack of production of insulin and Type 2 diabetes results from insensitivity of the body's cells to insulin.
a. true b. false
Endangered species
A. are mainly found in the tropics. B. are likely to be in danger of extinction in the future. C. will become extinct in the next 50 years. D. are in danger of extinction throughout all or most of their range. E. are those species found only in zoos, aquaria, and museums.
All of the following events can trigger an adaptive radiation EXCEPT _____
A) an unusual event splitting a habitat, such as a severe hurricane B) the evolution of a new morphological feature C) the extinction of competitors D) Hox gene duplication events