atherosclerosis
arteriosclerosis
Blood
It causes narrowing of the small blood vessels in tissues, resulting in an increase in blood pressure
The afferent arteriole.
vasoconstrictor
Histamine causes the dilation of the small blood vessels while constrict the large blood vessels.
Arteries.
capillaries
Capillary: A tiny blood vessel where substances are exchanged between the blood and the body cells.
When the heart beats it causes blood to flow through the blood vessels which causes them to expand. This expansion can be felt by touching the vessels that are close to the skin.
Capillaries via osmosis
when blood is in vessel, the blood may be black.