Health

Sitting for turkey? WHO reminds all to get more active

As the coronavirus leaves many people housebound and many Americans sit to feast for Thanksgiving, the World Health Organization says people need to get more active, insisting that up to 5 million deaths worldwide could be ...

Diseases, Conditions, Syndromes

What is COVID doing to our hearts?

Cardiologist Nisha Parikh, M.D., MPH, discusses what we know so far about COVID-19's impact on the body's cardiovascular system, from affecting the heart's rhythm to impairing its ability to pump blood throughout the body.

Cardiology

A bypass route for the coronary vessels in the heart?

Cardiovascular disease is the leading cause of mortality, and ischemic heart disease is a major cause of death worldwide. Coronary vessels that nourish the heart develop from three main sources, with the endocardium on the ...

Cardiology

A change of heart—new drug for HCM reduces heart mass

For the first time, a medication has impacted heart muscle thickness and function for patients with the most common inherited heart condition, rather than simply addressing their symptoms.

Sports medicine & Kinesiology

Get fit with HIIT

Getting fit by exercising intensely for a few minutes a day, several times a week, might sound too good to be true if COVID-19 lockdown has left you with an expanded waistline.

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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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