The thick, muscular middle layer of the heart is known as?

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Multiple Choice

The thick, muscular middle layer of the heart is known as?

Explanation:
The thick, muscular middle layer of the heart is the myocardium. This layer is made of cardiac muscle tissue arranged to contract forcefully, generating the pumping action that moves blood with each heartbeat. Its thickness reflects the workload of the chamber it surrounds—the left ventricle, which sends blood to the entire body, has the thickest myocardium to produce high pressure, while the right ventricle has a thinner muscular wall because it only pumps to the lungs. The outer layer is the epicardium, a thin protective surface; the inner layer is the endocardium, lining the chambers and valves; and the heart sits within the protective pericardium.

The thick, muscular middle layer of the heart is the myocardium. This layer is made of cardiac muscle tissue arranged to contract forcefully, generating the pumping action that moves blood with each heartbeat. Its thickness reflects the workload of the chamber it surrounds—the left ventricle, which sends blood to the entire body, has the thickest myocardium to produce high pressure, while the right ventricle has a thinner muscular wall because it only pumps to the lungs. The outer layer is the epicardium, a thin protective surface; the inner layer is the endocardium, lining the chambers and valves; and the heart sits within the protective pericardium.

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