The Normal Pacemaker of the Heart Is the

question 59

Multiple Choice

The normal pacemaker of the heart is the

• A)Purkinje fibers
• B)bundle of His
• C)atrioventricular (AV)node
• D)sinoatrial (SA)node
• E)atrioventricular (AV)bundle

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Definitions:

Spinal Cord

A long, thin, tubular bundle of nervous tissue and support cells that extends from the brain, running down the back, and acts as the main pathway for information connecting the brain and peripheral nervous system.

Meninges

Layers of connective tissue that enclose the brain and spinal cord.

Cerebrospinal Sheaths

Protective layers that surround the brain and spinal cord, consisting of the dura mater, arachnoid mater, and pia mater, collectively known as the meninges.

Acetylcholine

A neurotransmitter involved in many functions including muscle activation, heart rate, digestion, and brain processing.