Describe structure and function of alveoli?

Answer 1

Its structure is that of a balloon, and that helps it function during inhalation because it opens up to allow air to make contact with a large area to perform gas exchange.

The structure of the alveoli is that there are blood vessels wrapping around them. Then, oxygenin from the alveoli can enter the blood. The blood will give oxygen to all the body's tissues, and later, in the alveoli, carbon dioxide or CO2 can leave the blood and be exhaled. So, together, the alveoli, wrapped up by blood vessels, can bring oxygen to the rest of the body and also get rid of all the carbon dioxide.

Answer 2

The alveoli, also known as air sacs, exchanges oxygen and carbon dioxide with the bloodstream. The alveoli performs gaseous exchange, which are one of the most important parts of the respiratory system.

Answer 3

The alveoli structure is special as it helps it with its function.

• The alveoli is folded (look at its shape). This, therefore, increases the surface area to volume ratio - increasing the rate of diffusion of gases (oxygen and carbon dioxide)

• The alveoli has a thin layer of moisture. This makes diffusion of gases more efficient as the moisture helps diffuse the gaseous substances faster.

• Surrounding by a lot of capillaries. Thus, this supply a lot of blood to the alveoli - diffuse carbon dioxide from deoxygenated blood and diffuse oxygen into the oxygenated blood.

• The walls of the alveoli are one cell thick. This gives the oxygen and the carbon dioxide a short pathway for diffusion - making it diffuse faster.

Answer 4

Alveoli are similar to cells in the sense that they have a large surface area to volume ratio. This is advantageous since they depend on there surface to allow as much oxygen as possible to diffuse through.

Therefore, the correct answer would be something like this :

Since alveoli's have a large surface area to volume ratio, it oxygen to diffuse through. More oxygen can be absorbed. If the alveoli had a smaller surface area to volume ratio, it would be very difficult for oxygen to diffuse through. Therefore, it is advantageous for the alveoli to be small in volume, but great in surface area.

Answer 5

The alveoli are sac-like structures that contain air. They form part of the respiratory system and their function is to allow for the exchange of gases to take place.

Answer 6

Alveoli are micro sacs in the lungs that function to facilitate gas exchange between the air and blood.