1. Swati Kumari
  2. Science 10
  3. Thursday, June 16 2016, 06:58 PM
Define capillaries and its functions?
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On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one-cell thick and are called capillaries.

Exchange of material between the blood and surrounding cells takes place across this thin wall. The capillaries then join together to form veins that convey the blood away from the organ or tissue.
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