The capillaries. Check Wiki for "Capillary action".
capillaries
Blood and lymphatic vessels
Chemicals are exchanged between cells and blood through processes such as diffusion and active transport. Oxygen and nutrients are transported from the blood to the cells, while waste products and carbon dioxide are transported from the cells to the blood. This exchange occurs across the walls of capillaries, which have thin walls that allow for efficient diffusion of molecules between the blood and cells.
It causes narrowing of the small blood vessels in tissues, resulting in an increase in blood pressure
Diffusion. Diffusion is not a gas...it is a process. The answer is oxygen.
Simple epithelial tissues have no blood vessels and line or cover structures.
Those would be capillaries.
The capillaries. Check Wiki for "Capillary action".
capillarycapillaries
The capillaries. Check Wiki for "Capillary action".
Blood vessels that carry blood towards the body tissues are called arteries.
capillaries
Capillaries
Capillaries.
blood vessels
capillaries
In the blood
Capillaries