The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich ...

He completed his residency training through the ... The below chart from UCSF Benioff Children’s Hospital outlines the normal range of beats per minute for resting heart rate, based on age.

In severe cases, hypotension can compromise blood flow to the organs, increasing the risk of heart attack or stroke. A blood pressure reading has two numbers, which people often call the upper ...

Originally appeared on the NOVA Web site Cut to the Heart. Let's get straight to the heart of the matter—the heart's job is to move blood. Day and night, the muscles of your heart contract and ...