6.6 structure of the human gas- exchange system Flashcards
1
Q
why are the respiratory gases in large volumes?
A
- humans are relatively large organisms with a large volume of living cells
- they maintain a high body temperature which is related to them having high metabolic and respiratory rates
2
Q
why are the lunges located inside the body?
A
- air is not dense enough to support and protect the lungs
- the body would lose a greater deal of water and dry out
3
Q
what do bronchi produce?
A
mucus to trap dirt particles
4
Q
what do the cilia do in the bronchi
A
cilia that move the dirt- laden mucus towards the throat
5
Q
what are the bronchiole walls made up of?
A
muscles lined with epithelial cells
6
Q
what do the muscles in the bronchioles do?
A
constrict so that they can control the flow of air in and out of the alveoli
7
Q
what can be found between the alveoli?
A
collagen and elastic fibres
8
Q
what do the elastic fibres allow?
A
allow the alveoli to stretch as they fill with air when breathing in
9
Q
what is the gas-exchange surface in humans?
A
alveolar membrane
