Cardiology

Heart pump improves survival after severe heart attacks

Implantation of the Impella CP micro-axial flow pump in the hours after a heart attack significantly increased the rate of survival at six months among people suffering cardiogenic shock, according to a study presented at ...

Diseases, Conditions, Syndromes

Post-COVID not necessarily a barrier to exercise, finds study

People suffering from post-COVID have been discouraged from exercising because early observations suggested it could be harmful. In a study published in JAMA Network Open, researchers from Karolinska Institutet show that ...

Cardiac muscle

Cardiac muscle is a type of involuntary striated muscle found in the walls of the heart, specifically the myocardium. Cardiac muscle cells are known as cardiac myocytes (or cardiomyocytes). Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. The cells that comprise cardiac muscle are sometimes seen as intermediate between these two other types in terms of appearance, structure, metabolism, excitation-coupling and mechanism of contraction. Cardiac muscle shares similarities with skeletal muscle with regard to its striated appearance and contraction, with both differing significantly from smooth muscle cells.

Coordinated contraction of cardiac muscle cells in the heart propel blood from the atria and ventricles to the blood vessels of the circulatory system. Cardiac muscle cells, like all tissues in the body, rely on an ample blood supply to deliver oxygen and nutrients and to remove waste products such as carbon dioxide. The coronary arteries fulfill this function.

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