EVERYDAY SCIENCE

Detailed explanation-1: -Capillaries are tiny, extremely thin-walled vessels that act as a bridge between arteries (which carry blood away from the heart) and veins (which carry blood back to the heart).

Detailed explanation-2: -Capillaries, the smallest blood vessels, connect arteries and veins.

Detailed explanation-3: -Capillaries are the connection of the smallest branches of arteries and veins. The capillary walls are one cell thick. Capillaries allow molecules to pass through across the capillary walls. This exchange of materials is not possible across the walls of other types of blood vessels because the walls are too thick.

Detailed explanation-4: -Microscopic – walls are one cell thick, this allows for the diffusion of substances into the cells from the capillaries and out of the cells into the capillaries.

Detailed explanation-5: -The endothelial cells form a one-cell thick walled layer called endothelium that lines all of our blood vessels such as arteries, arterioles, venules, veins and capillaries.