Sided Muscular Pumps:
1. Right Heart: The right side of the heart consists of two chambers, the right atrium, and the right ventricle. It functions as a low-pressure pump that receives deoxygenated blood from the body and pumps it to the lungs for oxygenation.
2. Left Heart: The left side of the heart also has two chambers, the left atrium, and the left ventricle. It acts as a high-pressure pump that receives oxygenated blood from the lungs and pumps it out to the rest of the body.
So, in total, the mammalian heart has four chambers and two-sided muscular pumps: the right heart and the left heart.