The reaction of the cardiovascular system to higher levels of physical activity ____.
A. can be reasonably predicted by a fitness instructor
B. is fairly predictable
C. cannot be totally predicted
D. can be reasonably predicted by a doctor
E. is less a risk than generally perceived
Answer: C
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Synthetically produced substances sold under the false assumption that they are another drug are:
(a) hallucinogens (b) designer drugs (c) methadone injections (d) ephedrine and phe-nylpropolamine
The abbreviation RNA means ________ acid
Fill in the blank(s) with correct word
Which of the following is a professional health organization?
A) American Lung Association B) American Red Cross C) National Science Foundation D) American Public Health Association
Which of the following occurs within 24 hours of quitting smoking?
A) Chance of heart attack decreases. B) Coughing and shortness of breath decrease. C) Circulation improves. D) Cilia regrow in the lungs.