Cardiology

Heart failure deaths are highest in the poorest US counties

People living in counties with high rates of poverty are more likely to die from heart failure compared to people living in more affluent areas, according to new research published in Journal of the American Heart Association, ...

Cardiology

Tiny RNA provides big protection after a heart attack

Heart muscle can continue to die even after restoring blood following a heart attack, and scientists have new evidence that one way to help it live is by boosting levels of a tiny RNA that helped the heart form.

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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