In the heart's conduction system, what type of cells are present?

In the heart's conduction system, what type of cells are present?

• A. Specialized cells that do not contract but conduct electrical impulses.
• B. Contractile cardiomyocytes that generate force.
• C. Neurons from the peripheral nervous system.
• D. Endothelial cells lining the chambers.

Answer: (A)

Specialized, non-contractile conducting cells form the heart’s electrical wiring, initiating and rapidly propagating impulses to coordinate each heartbeat. These pacemaker and conducting cells (like the SA node, AV node, and Purkinje fibers) fire action potentials and pass the signal through gap junctions, so the tissue conducts electricity rather than contracting itself. This distinguishes them from contractile cardiomyocytes, which are the muscle cells that actually contract to pump blood. Peripheral neurons aren’t housed in the intrinsic conduction system, and endothelial cells lining the chambers and vessels don’t carry the heart’s electrical impulses. Therefore, the type of cells present are specialized conducting cells that do not contract but conduct electrical impulses.

Specialized, non-contractile conducting cells form the heart’s electrical wiring, initiating and rapidly propagating impulses to coordinate each heartbeat. These pacemaker and conducting cells (like the SA node, AV node, and Purkinje fibers) fire action potentials and pass the signal through gap junctions, so the tissue conducts electricity rather than contracting itself. This distinguishes them from contractile cardiomyocytes, which are the muscle cells that actually contract to pump blood. Peripheral neurons aren’t housed in the intrinsic conduction system, and endothelial cells lining the chambers and vessels don’t carry the heart’s electrical impulses. Therefore, the type of cells present are specialized conducting cells that do not contract but conduct electrical impulses.