Heart attacks are the result of:
a. valves that do not function correctly.
b. weakened heart muscle
c. blocked coronary arteries.
d. too much exercise.
c
FEEDBACK: a. Incorrect. Malfunctioning valves are not the cause of heart attacks.
b. Incorrect. Weakened heart muscles are not the cause of heart attacks.
c. Correct. Blocked coronary arteries cause heart attacks.
d. Incorrect. Too much exercise is not the cause of heart attacks.
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