The Cardiac Electrical Impulse Normally Begins Spontaneously in the Sinoatrial

question 25

Multiple Choice

The cardiac electrical impulse normally begins spontaneously in the sinoatrial (SA) node because:

• A)of its superior location in the right atrium.
• B)it is the only area of the heart capable of spontaneous depolarization.
• C)it has rich sympathetic innervation via the vagus nerve.
• D)it depolarizes more rapidly than other automatic cells of the heart.

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