Give me a full note on the topic ' heart '
Biology
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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.
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