B4: Breathing 🫁😮💨 Flashcards
1
Q
What do you need for gas exchange to work efficiently?
A
A steep concentration gradient.
2
Q
What separates the lungs from the digestive organs?
A
The diaphragm.
3
Q
What contracts and relaxes to help ventilation?
A
The intercostal muscles.
4
Q
How do intercostal muscles help ventilation?
A
By changing pressure in the lungs so air is forced in and out.
5
Q
What do clusters of alveoli provide?
A
Large surface area.
6
Q
Alveoli have a rich _____ ______.
A
Blood supply.
7
Q
How wide are the walls of alveoli?
A
One cell wide, making a very short diffusion distance.
