B4.5 - Breathing and gas exchange Flashcards
1
Q
Adaptations of the alveoli?
A
Large surface area
Thin walls
Rich blood capillary supply
2
Q
What happens to your lungs when you breathe in?
A
Contract
Muscles flatten
Volume or the thorax increases
Pressure in the thorax decreases
3
Q
What happens to your lungs when you breathe out?
A
Muscles relax
Volume of the thorax decreases
Pressure increases and air is forced out
