The P wave of an ECG is produced by the
A) depolarization of the ventricles.
B) depolarization of the atria.
C) repolarization of the ventricles.
D) repolarization of the atria.
Correct Answer:
Verified
Q35: The atria receive the impulses from the
A)SA
Q36: The pulmonary veins carry _ blood to
Q37: The contraction phase of a cardiac cycle,
Q38: The _ is(are) referred to as the
Q39: When the right atrium contracts, the
A)left atrium
Q41: Arteries contain _ than veins.
A)more smooth muscle
Q42: _ play an important role in controlling
Q43: Exchange of dissolved substances between the blood
Q44: All of the following mechanisms assist veins
Q45: Excess levels of blood K+
A)increase heart rate
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