HOW DOES YOUR HEART BEAT

Blood flows into your heart and flows out as seen on Pic:

- From Head to Head
- From Lungs to Lungs
- From Body to Body









YOUR HEART BEATS MORE THAN ONCE A SECOND EVERY DAYS OF YOUR LIFE. AS BLOOD FLOWS INTO YOUR HEART, THE MUSCLES CONTRACT, AND THE BLOOD FLOWS OUT AGAIN. THE HEART IS MADE OF A SPECIAL TYPE OF MUSCLE WHICH NEVER TIRES. THIS MUSCLLE CONTRACTS AND RELAXES 60 TO 80 TIMES A MINUTE, DURING EXERCISE THE RATE CAN INCREASE TO OVER 100 TIMES A MINUTE.