4 chamber hearts: Humans and birds
![Picture](/uploads/2/1/4/5/21451130/9752655.gif)
The 4 chamber heart is the most important organ for all mammals such as humans. This heart is made up of 2 atrium's and 2 ventricles. Used like all the other hearts, to pump oxygen throughout the body from head to toe. The heart pumps our body's vital minerals which help our body's function and remove waste which is not needed. For an example, the brain. it needs a constant supply of oxygen and glucose of it will fall conciseness so its the hearts job to pump the minerals and oxygen to the brain. Mammals like humans need to have 4 chamber hearts because there is more bone,more muscle,more organs that oxygen is needs to be sent to, oxygen needs to be speed evenly around the body so the a human can have a normal day.