The SA node is the heart's normal pacemaker because
A) it has the fastest rate of autorhythmicity
B) it has both sympathetic and parasympathetic innervation
C) it lies in the right atrium
D) activation of K+ channels occurs more rapidly in this region than elsewhere in the heart
E) it can directly stimulate atrial and ventricular cardiac myocardial contractile cells
Correct Answer:
Verified
Q22: Which of the following ECG waves represents
Q23: The direction of impulses through the conduction
Q24: An ectopic focus is the place where
A)an
Q25: The refractory period of cardiac muscle
A)lasts almost
Q26: The normal pacemaker of the heart is
Q28: The AV node
A)is the normal pacemaker of
Q29: The function of the atrioventricular node is
Q30: Which is the normal sequence of the
Q31: Which of the following is not occurring
Q32: Why can't tetanus occur in the heart?
A)There
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