A protein substance that is produced in the body in response to an invading foreign substance is called a/an:
A) antigen.
B) phagocyte.
C) platelet.
D) antibody.
D
Explanation:
A) An antigen is a protein that stimulates an immune response.
B) A phagocyte is a white blood cell that eats foreign cells.
C) A platelet is a clotting cell, a thrombocyte.
D) Correct.
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Why do premenopausal women have a much lower incidence of heart disease a. Premenopausal women have more niacin in their bloodstream
b. The female sex hormone estrogen tends to raise HDL cholesterol. c. Premenopausal women have less niacin in their bloodstream. d. The female sex hormone estrogen tends to lower HDL cholesterol. e. The female sex hormone estrogen tends to raise LDL cholesterol.
Exercise trained individuals have a lower oxygen deficit; this may be due to
A. a greater involvement of the ATP-CP energy system at the onset of exercise. B. having a better developed aerobic bioenergetic capacity. C. increased levels of glycolytic enzymes in the trained muscle. D. increased pulmonary lung capacity.
VO2 max can be estimated by drawing a line through the heart rate values measured during a submaximal graded exercise test and extrapolating to the age-adjusted maximal heart rate. This VO2 max estimate could be incorrect if
A. the subject held onto the treadmill railing during the test. B. the subjects true maximal heart rate was incorrectly estimated. C. the measurement of treadmill speed and grade were inaccurate. D. All of these answers are correct
In the terms milligram and milliliter, the prefix milli- means:
A) one-tenth. B) one-hundredth. C) one-thousandth. D) one-millionth.