unit 3; the mechanism of breathing Flashcards
1
Q
when is air forced into the lungs
A
when atmospheric air pressure is greater than air pressure inside the lungs- inhalation
2
Q
when is air forced out of the lungs
A
when air pressure in the lungs is greater then atmospheric air pressure- exhalation
3
Q
describe the diaphragm
A
sheet of muscle that separates the thorax and abdomen
4
Q
what leads to inhalation
A
the contraction of the internal intercostal muscles
5
Q
what leads to exhalation
A
the contraction of the external intercostal muscles
6
Q
briefly explain the mechanisms of inhalation
A
air in, ribcage moves outwards and diaphragm moves down
7
Q
briefly explain the mechanisms of exhalation
A
air out, ribcage moves inwards and diaphragm moves up
