What type of blood vessels allow the exchange oxygen and nutrients for waste products cellular level?

The type of blood vessels that allow the exchange of oxygen and nutrients for waste products at the cellular level are called capillaries. Capillaries are the smallest and most numerous type of blood vessel in the body and form extensive networks throughout the tissues. They have thin, porous walls that allow for the diffusion of substances between the blood and the surrounding tissue cells. Oxygen, nutrients, hormones, and other substances can pass from the blood into the cells, while waste products such as carbon dioxide can diffuse out of the cells and into the blood. This exchange of substances is essential for the functioning of cells and tissues throughout the body.