Respiratory Tract: Alveoli Flashcards
1
Q
When does bronchodilation occur?
A
When smooth muscle relax- more air can enter the bronchioles and alveoli
2
Q
What is bronchoconstriction?
A
Reduction in diameter due to smooth muscle contraction- reduces amount of air entering the alveoli
3
Q
What is there branches of around the alveolus?
A
Pulmonary artery and pulmonary vein
4
Q
Description of alveolus
A
One cell thick Surfactant secreting cell Surrounded by blood vessels Has macrophage Exchange of gases across blood vessels and alveolar boundary
5
Q
What is surfactant ?
A
Chemical secreted from alveolus
6
Q
What does a mixture pf surface acting chemicals do?
A
Reduce surface tension of fluid in the alveoli and enhances gas exchange
7
Q
Why does the mixture of surface acting chemicals do for the alveoli?
A
Stabilises it
Prevents alveolar flooding and collapse
8
Q
Example of surface acting chemicals
A
phospholipid
