The human body is the most fascinating and fantastic machine in existence. There are 600 muscles in the body. Bones might be classified as part of the circulatory system since they produce all of the body's blood cells within their marrow. Blood is a liquid organ.
Skin is the body's largest organ.
The liver is the second largest. Your heart is a hollow muscle about the same size as your fist. The sight and smell of the food makes special glands in your mouth produce saliva or spit. Everyone is color-blind at the beginning of life. That's because cone cells don't develop in the eyes until a baby is about six to eight months old.