Gas exchange Flashcards
1
Q
What is gas exchange?
A
the movement of oxygen into the blood and carbon dioxide put of the blood
2
Q
Where does gas exchange occur?
A
it occurs in the respiratory system
3
Q
What happens when you breathe in ?
A
- muscles between the ribs contract
- ribs are pulled up and out
- diaphragm contracts and flattens
- volume of the chest increases
- pressure inside the chest decreases
- air rushes into the lungs
4
Q
What happens when you breathe out ?
A
- muscles between ribs relax
- ribs are pulled in and down
- diaphragm relaxes and moves up
- volume in the chest decreases
- pressure inside the chest increases
- air is forced out of the lungs
5
Q
what happens in the respiratory system ?
A
- air enters the body through the mouth and nose
- air moves down the trachea (windpipe)
- air moves through a bronchus (smaller tube)
- air moves through the bronchiole (tiny tube)
- air moves into the alveolus (air sac)
- oxygen then diffuses into the blood
6
Q
what are the adaptions of the lungs that help the absorption of oxygen into the blood?
A
- it has a large surface area
- thin walls so oxygen can pass in easily
