De-oxygenated blood enters the heart via the
A) superior and inferior vena cava.
B) aorta.
C) right atrium.
D) left atrium.
Answer: A
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Sudden cardiac death most often occurs because of
A. low blood pressure. B. blocked cerebral arteries. C. arrhythmia. D. coronary thrombosis.
When collagen fibers stretch, they form ________ or stretch marks.
Fill in the blank(s) with the appropriate word(s).
HDL-cholesterol ____
a. is referred to as the "bad" cholesterol b. should be kept below 40 mg/dL c. removes cholesterol from the body which prevents plaque from forming in the arteries d. is generally higher in men e. increases with age
The four main reasons why injuries occur are overuse, poor footwear,
A. lack of warm-up, and lack of cool-down. B. too much exercise too soon, and worn out shoes. C. lack of coordination, and fatigue. D. weak or inflexible muscles, and mechanical problems. E. history of previous injury, and lack of conditioning.