Question of the day :
explain
:Blood vessels
:arteries
:capillaries
:veins
faster
Answers
BLOOD VESSELS :Any of the tubes in your body which blood flows through is called blood vessels.
ARTRIES :It is one of the tubes which take blood from the heart to other parts of the body.
CAPILLARIES :Any of the smallest tubes in the body that carry blood.
VEINS :Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.
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Answer :
Blood Vessels :
The flow of blood through all parts of the body in an orderly manner is called circulation . The blood vessels form a closed network through which blood is pumped by the heart to all parts of the body . Blood vessels are of the main types - arteries , capillaries and veins .
Arteries :
Arteries generally carry oxygenated blood ( blood that is rich in oxygen ) from the heart to the various parts of the body . The arteries that carry deoxygenated blood ( blood with less Oxygen and more carbon dioxide ) from the heart to the lungs are the only exceptions . Arterial walls are thick and Elastic to with stand the pressure of the blood being pumped into them by the heart . Arteries gradually divided into smaller branches that are called arterioles .
Capillaries :
Arterioles divide into smaller and smaller branches to form capillaries . Capillaries have very thin walls made up of a single layer of epithelial cells . The small size of the capillaries makes it possible for them to reach all parts of the body . The thin walls of the capillary allow the movement of Oxygen and nutrients into the neighbouring cell, and the uptake of carbon dioxide and other materials from these cells . The capillaries join up to form venules , which ultimately join up to form veins .
Veins :
Most veins carry deoxygenated blood from the various parts of the body to the heart . The veins that carries oxygenated blood from the lungs to the heart are the exceptions . The veins have a wider lumen ( cavity of a tubular structure ) than arteries and have thinner walls . Blood flows through them with less pressure than through the arteries . Veins have valves (gate like structures) to prevent blood from flowing back .
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