They are called capillary vessels. Some are so narrow that hemoglobin cells have to queue to go through them.
Capillary
artry
Arteioles are blood vessels that connect arteries and capillaries. Capillaries are blood vessels that connect arterioles and venules
Capillaries are the tiniest of the blood vessels. They connect arteries and veins.
The capillaries are the smallest blood vessels and are usually found between arteries and veins.
Capillaries
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Arteries - > Arterioles -> Capillaries
Capillaries are the tiniest blood vessels. They connect arteries and veins.
capillaries