The ____ is a muscular layer that actually performs the heart's work by contracting forcefully and ejecting blood from within the heart's chambers.

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Quizplus · Accepted Answer

The myocardium is the middle layer of the heart wall and is composed primarily of cardiac muscle cells that contract and relax to eject blood from the heart's chambers. The pericardium is the outermost layer of the heart, while the pleural layer refers to the membranes surrounding the lungs. The epicardium is the innermost layer of the heart wall.

The ____ Is a Muscular Layer That Actually Performs the Heart's