Facts about Human Heart

1. The “thump-thump” of a
heartbeat is the sound made by the
four valves of the heart closing.
2. The heart does the most physical work of any muscle during a lifetime. The power output of the heart ranges
from 1-5 watts. While the quadriceps can produce 100 watts for a few minutes, an output of one watt for 80
years is equal to 2.5 gigajoules.
3. The heart begins beating at four
weeks after conception and does not stop until death.
4. A newborn baby has about one
cup of blood in circulation. An adult human has about four to five quarts which the heart pumps to all the tissues and to and from the lungs in about one minute while beating 75 times.
5. The heart pumps oxygenated
blood through the aorta (the largest artery) at about 1 mile (1.6 km) per hour. By the time blood reaches the capillaries, it is moving at around 43 inches (109 cm) per hour.