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Why do capillaries have such thin walls?
Capillaries have thin walls to optimise the level of diffusion of oxygen and other nutrients in the blood stream to the surrounding cells.
Where does gas exchange occur?
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
Why are capillaries the site of material exchange between the cells and blood?
The walls of capillaries are very thin allowing the nutrients of cells to diffuse through them. They facilitate the diffusion of nutrients to the body by passing them through their cell walls.
Why do the walls of the capillaries and aveoli need to be thin?
The walls of alveoli are thin to allow the exchange of gases (Co2 and O2) between blood capillaries and the aveoli in the lungs.
Which part of the body has thin walls to allow oxygen to pass through?
Capillaries
Which part of the body has thin walls that allow oxygen to pass through?
Capillaries
Oxygen passes into the capillaries that surround these sac?
Oxygen passes into the capillaries that surround the alveoli. The thin walls of the capillaries make this diffusion easier.
Oxygen and nutrients pass from the blood to the bodys tissues through the thin walls of the?
Capillaries
True or false Capillaries have thin walls containing only one layer of cells?
true
How thick are the walls of capillaries compared to those of arteries and veins?
Arteries and veins have much thicker walls compared to capillaries. The largest arteries and veins have walls up to 5 mm thick, while capillaries have walls that are only one cell layer thick.
What are some similarities between capillaries and veins?
arteries take blood away from heart. veins take blood to the heart. capillaries have thin walls
Why do capillaries permit the diffusion of materials whereas arteries and veins do not?
why do capillaries permit the diffusion of materials, whereas arteries and veins do not? Because the capillaries are the only blood vessels whose walls are thin enough to permit exchanges between the blood and the surrounding interstitial fluid
