VENOUS BLOOD SYSTEM Meaning and
Definition
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The venous blood system refers to the network of blood vessels that carries deoxygenated blood from the body's tissues back to the heart. It is an integral part of the circulatory system and works in conjunction with the arterial blood system to ensure proper blood flow throughout the body.
The venous blood system consists of a vast network of veins, which are thin-walled blood vessels that carry blood towards the heart. These veins are distributed extensively throughout the body, with larger veins running parallel to the arteries and often sharing the same name or location. The venous system ranges from small, superficial veins located just beneath the skin, to larger deep veins that run alongside major arteries in the body.
Venous blood, also known as dark or unoxygenated blood, contains waste products such as carbon dioxide that are produced by the body's cells. The venous blood system is responsible for transporting this deoxygenated blood back to the heart, where it will be pumped to the lungs for oxygenation through the pulmonary circulation. Once oxygenated, the blood will then be delivered to the body's tissues through the arterial blood system.
The venous blood system relies on various mechanisms to assist blood flow against gravity, particularly in the lower extremities. Valves within the veins prevent backward flow of blood, while muscular contractions and respiratory movements also aid in propelling blood towards the heart. Disruption to the normal functioning of the venous blood system can lead to conditions such as varicose veins or deep vein thrombosis.
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