What is myocardium?
myocardium is a muscle layer of heart, responsible for the pumping effect of the heart that gives the whole body with blood. Myocardium consists of a heart muscle, a muscle type unlike another muscle in the body. The heart muscle combines the features of the skeletal muscle that controls the voluntary movement of the body and the smooth muscles that control the movement of all organs of the body other than the heart.
myocard is the middle layer of the heart wall; The farthest layer is the epicardium, while the innermost is the endocardium. Epicardium consists mainly of connective tissue and serves to protect the inner structures of the heart. The endocardium is a thin layer of epithelial cells, a similar layer that lines the inside of the blood vessels.
The heart muscle that makes up myocardium is involuntary, such as a smooth muscle in other body organs. The involuntary muscle is not under conscious control and is in contrast to the voluntary skeletal muscle that is attached to the skeleton and is used for skeletal movement such as walking and standing. However, the heart muscle is more similar in the bone structureErine muscle than in smooth muscles. The heart muscles and skeletal muscles are striped, which means that muscle fibers are arranged in parallel bundles and have alternating strong and thin proteins. The cultivated muscle is more suitable for short, intense contractions than a smooth muscle.
While skeletal muscles fibers are arranged to regular, non -barriers, muscle fibers of myocardial branch at irregular angles and associate with other muscle cells at intersections called intercaled discs. Cells that make up heart muscles are called cardiac myocytes or cardiomyocytes. It also differs from skeletal cell cells in that they require extracellular calcium for contraction.
TyoKardium contraction is responsible for drawing oxygenated blood throughout the body and provides the body of oxygen and other nutrients that must function properly. The heart muscle also pumps deoxygenated blood into the lungs to moanhl be again oxygenated. After blood supplies oxygen throughout the body, deoxygenated blood returns to the heart, which in turn pumps blood into the lungs. After the blood is reoxygenated in the lungs, it returns to the heart to be pumped throughout the body. Like all body tissues, the myocardium itself requires the blood supply to work; Coronary arteries supply heart muscles with blood.