Give one word for the following:

The thinnest blood vessels in the body.

Blood vessels:

1. These are hollow tubes made up of dense and elastic connective tissue.
2. Arteries, veins, and capillaries are the three types of blood vessels.
3. Arteries carry oxygenated blood (except the pulmonary artery).
4. Veins carry deoxygenated blood (except the pulmonary vein).
5. Capillaries are the thinnest blood vessels in the body.
6. Capillaries help in gaseous exchanges between the tissue and blood.

Hence, the thinnest blood vessels in the body are capillaries.