mechanics of breathing

Question 1

what happens at the first stage of inspiration at rest

Answer 1

the diaphragm and external intercostals contract lifting the rib cage up and out

Question 2

what effect does the first stage have on the theoretic cavity

Answer 2

increase the size inside in turn decreasing the pressure

Question 3

what happens to the partial pressure of the gases in the lungs

Answer 3

the pressure decreases causing air from the outside to rush in

Question 4

what happens as a result of the decrease in partial pressure in the lungs

Answer 4

air rushes into the lungs leading to inspiration

Question 5

what happens at the first stage of expiration at rest

Answer 5

the diaphragm and intercostal muscles relax flattening the rib cage

Question 6

what does this do to the theoretic cavity

Answer 6

decreases the area in the cavity increasing pressure

Question 7

what happens to the partial pressure in the lungs because of this

Answer 7

increases the pressure in the lungs

Question 8

what does the increase in pressure cause

Answer 8

air to rush out of the lungs cause you to
exhale