In just 60 seconds, the average adult heart pumps about 1.5 gallons (5.7 liters) of blood. X-rays of ancient Egyptian mummies show that people had heart disease more than 3,000 years ago.

Fast heart rate can indicate age or genderA newborn’s heart rate is around 70 to 190 beats per minute. The average adult has a resting heart rate between 60 and 100 beats per minute.

Fast heart rate can indicate age or gender A newborn’s heart rate is around 70 to 190 beats per minute. The average adult has a resting heart rate between 60 and 100 beats per minute.

The heart's electrical signals start in the heart's "pacemaker," a specific node of cells. Located in the upper right atrium, the crescent-shaped pacemaker measures about half an inch (13.5 ...