Cardiology

Defective cilia linked to heart valve birth defects

Bicuspid aortic valve (BAV) is the most common heart valve birth defect and one of the most common birth defects of any type, affecting around 70 million people worldwide. A healthy aortic valve has three leaflets; in BAV ...

Obstetrics & gynaecology

Is vigorous exercise safe during the third trimester of pregnancy?

Expectant mothers receive an avalanche of information about potential risks to their baby. There's a growing list of foods, toxins and environmental threats to avoid. It's normal for this to lead to an increased level of ...

Medical research

Deaths halved among infarct patients attending Heart School

Patients who attend 'Heart School,' as almost every patient in Sweden is invited to do after a first heart attack, live longer than non-participating patients. This is shown in a new study, by researchers at Uppsala University, ...

page 1 from 3

Heart

The heart is a muscular organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart."

The heart of a vertebrate is composed of cardiac muscle, an involuntary striated muscle tissue which is found only within this organ. The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during a lifetime (about 66 years). It weighs on average 250 g to 300 g in females and 300 g to 350 g in males.

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