B4: Breathing 🫁😮‍💨

Question 1

What do you need for gas exchange to work efficiently?

Answer 1

A steep concentration gradient.

Question 2

What separates the lungs from the digestive organs?

Answer 2

The diaphragm.

Question 3

What contracts and relaxes to help ventilation?

Answer 3

The intercostal muscles.

Question 4

How do intercostal muscles help ventilation?

Answer 4

By changing pressure in the lungs so air is forced in and out.

Question 5

What do clusters of alveoli provide?

Answer 5

Large surface area.

Question 6

Alveoli have a rich _____ ______.

Answer 6

Blood supply.

Question 7

How wide are the walls of alveoli?

Answer 7

One cell wide, making a very short diffusion distance.