The first heart sound _______.
A) marks the beginning of ventricular diastole
B) is caused by the closure of the AV valves
C) is caused by the closure of the semilunar valves
D) answers a and b are correct
Correct Answer:
Verified
Q2: A small muscular pouch called the _
Q3: The release of _ by sympathetic nerves
Q4: Two _ arteries branch off the aorta
Q5: In a trained athlete, the heart _.
A)
Q6: The _, or pacemaker of the heart,
Q8: The cardiac muscle becomes _, or lacking
Q9: The sequence of blood flow through
Q10: The condition in which the heart rate
Q11: According to _ law of the heart,
Q12: The valve between the left ventricle and
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