Heart

Heart

The heart is a muscular organ that acts as a pump, moving blood throughout the body. Blood delivers oxygen and nutrients to cells and removes waste. As part of the circulatory system, the heart works with the respiratory and digestive systems to meet the body’s needs. Its chambers, the atr...

Your heart is a strong, muscular organ that acts like a pump, moving blood throughout your body.

Your heart is roughly the size of your fist. It sits at the center of your chest slightly to the left, protected by the ribcage.

The heart has four chambers: two atria on the top and two ventricles on the bottom.

Blood first enters ...