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Anthony Mossop

About The Human Veins

Internally, the heart is divided into four hollow chambers, two on the left and two on the right. The upper chambers, called "atria," have relatively thin walls and receive blood returning through the veins. The lower chamber, the "ventricles," force blood out of the heart into the arteries to be carried back to the various sites throughout the body. Veins are responsible for returning blood to the heart after exchanges of gases, nutrients, and wastes have been made between the blood and the body cells. Veins begin when capillaries merge into venules, the venules into small veins, and the small veins merge into larger ones. They are harder to follow than the arteries, because these vessels are interconnected with irregular networks, so that many small unnamed venules may join to form a larger vein. On the other hand, larger veins typically parallel the courses taken by named arteries, and the veins are often given the same name as the companion arteries. The veins from all parts of the body except from the lungs back to the heart converge into two major paths that lead to the right atrium of the heart. These veins are the "superior vena cava" and the "inferior vena cava."


Veins

Internally, the heart is divided into four hollow chambers, two on the left and two on the right. The upper chambers, called "atria," have relatively thin walls and receive blood returning through the veins. The lower chamber, the "ventricles," force blood out of the heart into the arteries to be carried back to the various sites throughout the body. Veins are responsible for returning blood to the heart after exchanges of gases, nutrients, and wastes have been made between the blood and the body cells. Veins begin when capillaries merge into venules, the venules into small veins, and the small veins merge into larger ones. They are harder to follow than the arteries, because these vessels are interconnected with irregular networks, so that many small unnamed venules may join to form a larger vein. On the other hand, larger veins typically parallel the courses taken by named arteries, and the veins are often given the same name as the companion arteries. The veins from all parts of the body (except from the lungs back to the heart) converge into two major paths that lead to the right atrium of the heart. These veins are the "superior vena cava" and the "inferior vena cava."

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