What is the function of cardiac muscle?

What is the function of cardiac muscle?

• A. To contract and pump blood throughout the body.
• B. To store energy in the heart.
• C. To transmit nervous impulses.
• D. To produce heart valves.

Answer: (A)

Cardiac muscle’s primary job is to contract and generate the pumping action that moves blood through the heart into the lungs and the rest of the body. The heart’s muscle cells are wired together with intercalated discs and gap junctions, allowing them to contract in a coordinated, rhythmic way so the ventricles eject blood efficiently with every beat. This pumping maintains circulation and arterial pressure, ensuring oxygen and nutrients reach tissues. Storing energy, transmitting nervous impulses, and producing heart valves aren’t the duties of cardiac muscle—the first is handled by metabolic reserves, the second by the nervous system and specialized conduction pathways, and the third by other heart structures and tissues.

Cardiac muscle’s primary job is to contract and generate the pumping action that moves blood through the heart into the lungs and the rest of the body. The heart’s muscle cells are wired together with intercalated discs and gap junctions, allowing them to contract in a coordinated, rhythmic way so the ventricles eject blood efficiently with every beat. This pumping maintains circulation and arterial pressure, ensuring oxygen and nutrients reach tissues. Storing energy, transmitting nervous impulses, and producing heart valves aren’t the duties of cardiac muscle—the first is handled by metabolic reserves, the second by the nervous system and specialized conduction pathways, and the third by other heart structures and tissues.