1
Q
Mechanisms of breathing
A
Inspiration- breathing in
Expiration- breathing out
2
Q
Inspiration
A
The thoracic cavity increases in size, allowing the lungs to expand and the pressure inside them to drop
3
Q
Expiration
A
Thoracic cavity decreases in size, allowing the lungs size to decrease and the pressure inside to increase
4
Q
Breathing in
A
Thoracic cavity gets bigger, External intercostal muscles contract, Ribs move up and out, Diaphragm contracts and flattens, Air pressure decreases
5
Q
Breathing out
A
Thoracic cavity gets smaller, Internal intercostal muscles contract, Ribs move down and in, Diaphragm relaxes (curves/dome shape), Air pressure increases
