This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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The heart is a muscular organ responsible for pumping blood throughout the body. It's located in the chest, slightly to the left, between the lungs. • The heart has four chambers: two upper atria (right and left) and two lower ventricles (right and left). • The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs. • The left side of the heart receives oxygenated blood from the lungs and pumps it to the rest of the body. • Valves (tricuspid, pulmonary, mitral, and aortic) ensure blood flows in only one direction. • The heart muscle itself is called the myocardium, and it receives its own blood supply from the coronary arteries. • The cardiac cycle refers to the sequence of events during one heartbeat, involving contraction (systole) and relaxation (diastole) of the chambers. That's 1 down. 4 left today — send the next one.