Size. The heart of an adult is about the size of two hands clasped together, while a child’s heart is about the size of a fist
Newborn’s heart rate is usually between 70 and 190 beats per minute, while an adult’s resting heart rate is typically between 60 and 100 beats per minute
Female heart rate is about 8 beats a minute faster than a man’s
Blood flow. The heart pumps about 9000 L of blood throughout the body each day, which travels about 12,000 miles
Blood vessel length. There are 60,000 miles of blood vessels in your body. That’s enough to go around the world twice
Blood colour. Blood entering the heart is purplish-blue because it doesn’t contain oxygen, while blood exiting the heart is red because it does contain oxygen
Heart shape. The heart of an astronaut becomes more spherical in shape due to microgravity during space travel
Every cell, other than the cornea, gets blood from the heart
First open-heart surgery occurred in 1893. It was performed by Daniel Hale Williams, who was one of the few black cardiologists in the USA at the time
Heart cancer. Heart cancer is rare because heart cells stop dividing in adulthood.
