a capillary
capillary walls are very thin, often a cell thick. artery walls have two thick layers.
artery
The aorta is the largest artery.
There is no portal artery. A portal vein connects one capillary bed to a second capillary bed. (in series)
a capillary
Care for sea.
the smallest blood vessel is the capillary, then the vein, and the artery. (vein and artery depends though because when they diffuse they get smaller and close to the same size) but the smallest will always be the capillary.
Artery, Vein and Capillary
a small artery that leads to a capillary network
Myrae Ging Bonner
Artery -> Arteriole -> Capillary -> Venule -> Vein