Intrinsic Control of Heartbeat Rate Involves What Mechanism(s)

question 5

Multiple Choice

Intrinsic control of heartbeat rate involves what mechanism(s) ?

• A) The AV node initiates heartbeat, although the SA node can generate a slower beat rate.
• B) The atrioventricular bundle initiates signals that travel to the Purkinje fibers.
• C) The Purkinje fibers initiate signals that travel to the atrioventricular bundle.
• D) The SA node initiates heartbeat and the AV node inhibits the heartbeat.
• E) The SA node initiates heartbeat, although the AV node can generate a slower beat rate.

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Definitions:

Testis

The male reproductive gland that produces sperm and testosterone, found in the scrotum.

Inguinal Ring

An anatomical structure in the groin area through which the spermatic cord (in men) and the round ligament of the uterus (in women) pass.

Direct Inguinal

Pertaining to a type of hernia that occurs when tissue protrudes directly through a weak spot in the abdominal muscles near the inguinal canal.

Femoral

Pertaining to the femur or thigh bone, often used in context of femoral arteries, nerves, or fractures.