Mechanics of Breathing Flashcards
1
Q
What are the two ways of breathing?
A
inspiration
expiration
2
Q
What is inspiration?
A
diaphragm contacts - flattens
external intercostal muscles contract - ribs move up and out
increases the volume of thorax
decreases the pressure in the thorax
air moves in from high to low pressure
3
Q
What is expiration?
A
diaphragm relaxes - becomes domed
external intercostal muscles relax- ribs move down and in
decreases the volume of thorax
increases the pressure in the thorax
air moves out from high to low pressure
4
Q
What is forced expiration?
A
internal intercostal muscles contract - pulls ribcage down and in more
internal and external intercostals are called antognostic pairs
