Diaphragm and lungs

Question 1

What does a large surface area do?

Answer 1

It creates a larger surface area for diffusion to occur, this is due to many folded alveoli.

Question 2

Why do thin walls help?

Answer 2

One cell thick walls mean the capillaries are a short distance for diffusion

Question 3

What does it mean when the concentration gradient is maintained?

Answer 3

Ventilation brings lots of oxygen and constant flow of blood, creating a very good blood supply.

Question 4

What do many capillaries do?

Answer 4

They ensure fresh blood is always present.

Question 5

More carbon dioxide = ?

Answer 5

Faster diffusion

Question 6

What are the steps of inhilation?

Answer 6

1) Diaphragm contracts and flattens
2) Intercoastal muscles flatten and contract
3)Rib cage moves upwards and outward
4)Causes an increase in capacity volume
5)Causes a decrease in pulmonary pressure
6)Air is forced into the lungs

Question 7

What are the steps of exhalation?

Answer 7

1)Diaphragm relaxes
2)Intercoastal muscles relax
3)Rib cage moves forward and downward/inward
4)Causes an increase in pulmonary pressure
5)Pulmonary pressure is now greater than air pressure in the lungs, forcing air out the lungs