Which of these is the correct structural design of a heart to act as a pump?
4 chambers: 2 atria and 2 ventricles
A heart has 4 chambers: 2 atria and 2 ventricles which contract and relax in a rhythmic manner to impart pump-like action. The 4 chambers are isolated from each other by muscular walls and valves which prevent backflow of blood and mixing of oxygen-rich blood with carbon dioxide-rich blood. The heart is made of involuntary muscles, which means that the functioning of these muscles is not under our control. The heart works continuously day and night without any rest, and this is what keeps us alive.