Unit 4- 2.3~ Gaseous exchange

Question 1

What is gaseous exchange?

Answer 1

The process by which oxugen is transported to cells and carbon dioxide is taken away fom cells

Question 2

What is the role of alveoli walls?

Answer 2

Aveoli walls has a thin lining that enables a fast diffusion of gas exchange between the air in the alveoli and the blood in the surrounding capillaries

Question 3

What is the structure of the alveoli walls?

Answer 3

• Type I cells: Flat cells that allow oxygen and carbon dioxide to pass through
• Type II cells: Produces a substance to keep alveoli from collapsing
• Capillaries: Tiny blood vessels surrounding the alveoli for gas exchange
• Elastic fibre: Helps alveli stretch and recoil during breathing

Question 4

Explain diffusion gradients

Answer 4

Gas exhange is achieved by diffusion. This is where particles move from a high concentratoin are to a low concentration are. They move down a concetration gradient the steeper the gradient is and the faster the rate of diffusion

Question 5

What is the role of erythrocytes?

Answer 5

To carry and deliver the oxygen to the tissue in our body, usually in the hemegloblin.

Question 6

What is the role of plasma?

Answer 6

Plamsa acts as a transport medium for deliver hormones, nuntriets to our body, helping oxygen and carbon dioxide exchange.