How long should a Workout be
a. 5-10 min
b. 20-30 min
c. 5-15 min
Answer: b. 20-30 min
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Which of the following statements is true of homocysteine?
A. The higher the level of homocysteine in the blood, the better the cardiac health. B. Its accumulation encourages blood clotting, leading to a heart attack or stroke. C. It is consumed to lower triglyceride and lipoprotein-a levels. D. It is a by-product of the breakdown of "bad" cholesterol. E. It interferes with the cellular breakdown of the amino acids methionine and cysteine.
What component of sunlight causes most skin damage?
A. infrared radiation B. ultraviolet radiation C. electromagnetic radiation generated by sunspots D. ozone in the upper atmosphere E. gamma radiation
List three prominent American values as presented in the text, and explain how each value might contribute to stress
Cardiorespiratory endurance has been referred to as "cardiovascular fitness" because
A. the heart and vessels make up the circuit for the circulation of blood. B. the respiratory system is regulated by the circulatory system. C. the circulatory and respiratory systems do the same things. D. the vascular systems perform respiratory functions.