a detailed visual guide to the human hearts systolic and diastolic cycles unveiling the intricate network of blood

blood cardiovascular circulation diagram medical vessels chambers organ network detailed internal system artery vein capillary ventricle atrium septum valve pulmonary aorta coronary circulatory oxygen nutrient transport exchange pumping contraction relaxation muscle tissue fibers mitochondria metabolism systolic diastolic physiology flow cardiac healthy heart human body oxygenation deoxygenation valves function medicine anatomy organs