Cardiovascular System - The organ system that comprises the heart and blood vessels, responsible for circulating blood throughout the body., Organ - In biology, an organ (from the Latin "organum" meaning an instrument or tool) is a collection of tissues that structurally form a functional unit specialized to perform a particular function., Heart - The muscular organ that pumps blood throughout the circulatory system., Blood Vessels - Tubular structures that carry blood throughout the body. The main types include arteries, veins, and capillaries., Arteries - Blood vessels that carry oxygenated blood away from the heart to the body's tissues., Veins - Blood vessels that return deoxygenated blood from the body's tissues back to the heart., Capillaries - Tiny blood vessels where the exchange of oxygen, nutrients, and waste products occurs between the blood and surrounding tissues., Aorta - The largest artery in the body, originating from the left ventricle of the heart and distributing oxygenated blood to the rest of the body., Coronary Arteries - Blood vessels that supply the heart muscle with oxygen and nutrients., Myocardium - The muscular tissue of the heart., Endocardium - The inner lining of the heart chambers., Atrium - (plural: Atria): The upper chambers of the heart that receive blood., Ventricle - The lower chambers of the heart that pump blood out of the heart., Cardiac cycle - The sequence of events that occurs during one heartbeat, including systole (contraction) and diastole (relaxation) of the heart chambers., Blood pressure - The force exerted by blood against the walls of blood vessels, typically measured as systolic pressure over diastolic pressure., Hypertension - High blood pressure, a condition where the force of blood against the arterial walls is consistently too high., Atherosclerosis - A condition in which fatty deposits (plaques) build up on the inner walls of arteries, narrowing and restricting blood flow.,

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