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प्रश्न
Write three types of blood vessels. Give one important feature of each.
उत्तर
Three main types of blood vessels that are found in the human body are arteries, veins, and capillaries.
Arteries carry blood from the heart to different body parts. Veins bring blood from different body parts to the heart. Valves are present in veins to prevent the backward flow of blood. Both arteries and veins divide in the organs to form arterioles and venules respectively. The arterioles sub-divide to form thin-walled capillaries which join to form venules. Venules join to form veins. The nutrients, hormones, gases can diffuse into the tissue cells through the walls of the capillaries and vice versa. Thus, arteries, arterioles, veins, venules, and capillaries are blood vessels.
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