define veins?
what is systol?how much pressure in systol?
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Answer: Veins are a type of blood vessel, which forms a dense network throughout the body. They generally carry deoxygenated blood from body parts to hearts for oxygenation, with an exception of pulmonary vein, it is involved in pulmonary circulation, where it carries oxygenated blood from the lungs to heart, which is then pumped to all other body parts.
Explanation:
The veins are generally smaller than arteries are, and the pressure of blood flowing through it is lesser, than in arteries. They are generally placed just below the surface of our skin. They also have valves present in them to prevent back flow of blood
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