Cardiovascular

The heart is a muscular organ about the size of a fist, located in the mediastinum between the lungs. It pumps approximately 5 lit...

Blood is a specialized connective tissue, approximately 5 liters in adults 7 to 8 percent of body weight. It consists of plasma 55...

The circulatory system has approximately 100,000 km of blood vessels. Arteries carry blood away from the heart, with thick walls o...

The four heart valves ensure unidirectional blood flow. The atrioventricular valves are between atria and ventricles: tricuspid ri...

The coronary arteries supply the heart muscle myocardium with oxygenated blood, delivering approximately 250 mL per minute 5 perce...

The aorta is the largest artery in the body. It arises from the left ventricle at the aortic valve, rises as the ascending aorta, ...

The pericardium is a double walled sac that encloses the heart and the roots of the great vessels. Its tough outer fibrous layer a...

The sinoatrial node is a small cluster of specialized cardiac muscle cells in the upper wall of the right atrium that acts as the ...

The venae cavae are the two largest veins in the body, returning deoxygenated blood from the systemic circulation to the right atr...

The carotid arteries are the main blood vessels supplying the head and neck. The right common carotid artery arises from the brach...