2007-03-28 13:43:30 · 4 answers · asked by chris z 1 in Science & Mathematics ➔ Biology
These are sites with a high amount of oxygen and nutrient exchange. Capillaries increase surface area, and increase the amount of transfer possible.
2007-03-28 13:56:31 · answer #1 · answered by Hauntedfox 5 · 1⤊ 0⤋
Actually, The Main function of Capillaries, is so that nutrients can diffuse across it. In the lungs and muscles, O2 CO2 and wastes are exchanged through the capillaries, same goes for the Placenta, the mother must be able to exchange nutrients and oxygen to the fetus so the thinnest blood vessels make up the placenta, which are the capillaries.
Basically, the capillaries are the thinnest blood vessel, then veins, then Arteries. Capillaries are thin so nutrients can be exchanged. The lungs have the aveoli that get the oxygen and get rid of the Carbon Dioxide because it is in proximity to the capillaries thus making it possible.
2007-03-28 21:04:42 · answer #2 · answered by Marc 2 · 0⤊ 0⤋
There motion takes place.
Motion needs energy.
Energy becomes from nutrients burnt in the cell with the aid of oxygen.
Blood delivers these two in huge amounts where mostly needed.
2007-03-28 20:50:39 · answer #3 · answered by fedebicho 3 · 0⤊ 0⤋
The locations are of high metabolic activity..
2007-03-28 20:52:45 · answer #4 · answered by ttumdg86 2 · 0⤊ 0⤋