The absorption of what mineral is enhanced by vitamin C?
a. selenium
b. iron
c. zinc
d. copper
Ans: b. iron
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Which of the following amphibians has no legs, even in reproductively mature adults?
a) salamanders b) frogs c) caecilians d) snakes e) none of the above
What muscle tissue is considered involuntary?
a. skeletal only b. smooth only c. cardiac only d. both skeletal and cardiac e. both cardiac and smooth
Reptiles, birds, and insects excrete nitrogenous wastes in the form of
A. uric acid. B. urine. C. urea. D. ammonia.
Which of the following changes would be expected to cause vasoconstriction in an arteriole?
A. increases in carbon dioxide B. increases in lactic acid C. increases in potassium ion concentration D. decreases in pH E. None of the changes listed for this question would cause vasoconstriction.