Human gas ecxchange system and ventilation

Question 1

What does human gas exchange consist of?

Answer 1

trachea, lungs, bronchi, bronchioles, alveoli

Question 2

Inhalation

Answer 2

-diaphragm contracts
- external intercostal muscles contract
- in the thorax : causes volume to increase and pressure to decrease
= air is forced into the lungs

Question 3

Exhalation

Answer 3

-diaphragm relaxes
-Internal intercostal muscles contract
- in the thorax : volume decreases , pressure increases
= air is forced out of lungs