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When the right ventricle contracts, blood is ejected through the pulmonary valve into the pulmonary arteries, where carbon dioxide is exchanged for oxygen in the lungs.Bright red oxygenated blood returns to the left atrium in the pulmonary veins. Systemic Pathways Two thin-walled atria sit atop two thick-walled ventricles.

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It is the right atrioventricular valve that connects the right atrium and the right ventricle.The mitral valve resembles a miter- a two-cusped hat worn by bishops.When the right atrium is filled with venous blood, it contracts and forces blood through the tricuspid valve into the right ventricle.After the right ventricle fills, the tricuspid valve snaps shut and prevents blood from flowing back into the right atrium.The pulmonary circulation is the only place where veins carry oxygenated blood and an artery carries deoxygenated, carbon dioxide-laden blood.

One way to remember the function of arteries is that Arteries carry blood Away from the heart; the only exception are coronary arteries, which is explained below.The pulmonary valve regulates flow between the right ventricle and the pulmonary artery.The aortic and pulmonary valves have three cusps, and are called semilunar valves because they are half-moon shaped.It is the left atrioventricular valve that connects the left atrium to the left ventricle.The aortic valve opens between the left ventricle and the aorta.To deliver oxygen and essential nutrients- such as carbohydrates, fats, and proteins- to the body’s tissues To remove cellular waste products such as carbon dioxide and urea, a nitrogen-containing end product of protein breakdown Dark red venous blood that is low in oxygen returns to the right atrium in the two largest veins: the , which collects blood from the chest, abdomen, and legs.