The SA Node Is the Heart's Normal Pacemaker Because

question 197

Multiple Choice

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

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