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Why do air sacs need to have a rich supply of capillaries?
They need a lot of blood.
Do red blood cells have to squeeze through veins arteries or capillaries?
Capillaries, as they are the smallest blood vessels in the body, thus the need to "squeeze"
Why do capillaries need to be so thin?
so they can allow for gas exchange
Capillaries that have a incomplete lining are called?
continuous capillaries continuous capillaries
Why must capillaries have a greater surface area to volume ratio compared to arteries?
Capillaries are tiny blood vessels. They need to have a greater surface area to volume ratio because they need to diffuse oxygen quicker.
Why is capillaries narrow?
Capillaries are very small in size because they need to have a large surface area so they are able to transport blood all around the body. Blood cells must pass in single file through the capillaries as they are so small.
Where do arterioles direct blood?
Arterioles carry blood from larger arteries to capillaries. This blood is high in oxygen. Capillaries bring blood to cells which need oxygen for energy production.
Why is it critical to your cells to be near capillary?
Cells need to be near capillaries because capillaries carry blood which in turn brings food/fuel to the cells and removes waste products.
What structures connect the smallest arteries with the smallest veins?
Capillaries are the structures that connect arteries to veins.
What blood vessels surround the aveoli?
Capillaries The smallest of the blood vessels: capillaries.
Why are there capillaries in eyelids instead of arteries or veins?
capillaries are smaller than arteries and veins. they need to be small or it would look wierd with big buldges sticking out of your eye lids. :P
Why is it possible for diffusion to take place at the capillaries and not in the arteries and veins?
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.
