Medical research

Surplus antioxidants are pathogenic for hearts and skeletal muscle

Many heart diseases are linked to oxidative stress, an overabundance of reactive oxygen species. The body reacts to reduce oxidative stress—where the redox teeter-totter has gone too far up—through production of endogenous ...

Medical research

Arteries respond in opposite ways for males and females

A protein known to expand blood vessels—key to controlling conditions like high blood pressure—actually has different functions in males and females, new UC Davis Health research shows.

Medical research

Heart cells can rejuvenate and multiply to heal damage

UT Southwestern Medical Center scientists have discovered a protein that works with others during development to put the brakes on cell division in the heart, they report today in Nature. The findings could eventually be ...

Cardiology

How does COVID-19 affect the heart?

The effects of COVID-19 on the lungs are well-known. As the COVID-19 pandemic continues, more information is becoming available about the role the virus, called SARS-CoV-2, has on the heart. "Individuals with known cardiovascular ...

page 1 from 97

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.

This text uses material from Wikipedia, licensed under CC BY-SA