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liquid can leak in and out of capillaries, and arteries and veins have such thick walls, and their jobs are just to bring blood to and from the heart. NO need for diffusion in these.
Its all diffusion.
no
They are one cell thick to allow diffusion of gases to take place
capillarycapillaries
Capillaries. The diffusion of nutrients, oxygen, carbon dioxide and wastes take place in the capillaries. If you want to be more specific, it would be the venous ends of the capillaries where carbon dioxide enters the blood.
Exchange takes place by diffusion .
The capillaries. Check Wiki for "Capillary action".
Capillaries must allow diffusion too allow for exchange of oxygen. Without oxygen, the eventual consequence would be death.
The capillaries. Check Wiki for "Capillary action".
capillaries
Capillaries