Mechanics Of Breathing

Question 1

How do humans breathe

Answer 1

Oxygen diffuses from alveolar air space into blood down its concentration gradient
Across alveolar epithelium then across capillary endothelium

Question 2

During inspiration the external intercostle muscles _____ (what happens to the ribs)

Answer 2

Contract
The ribs are pulled up and out)

Question 3

During inspiration the internal intercostals muscles _____

Answer 3

Relax

Question 4

During inspiration the diaphragm _____

Answer 4

Contracts
Lies flat

Question 5

During inspiration the air pressure in the lungs _____

Answer 5

Drops because air is that was in the lungs is moving out but then as the air that’s just been inhaled moves in it rises

Question 6

During inspiration the lung volume _____

Answer 6

Increases

Question 7

During inspiration the how does the air move?
Air moves ____ lungs from atm pressure into _____ pressure

Answer 7

Into
Lower

Question 8

During expiration the external intercostle muscles _____

Answer 8

Relax

Question 9

During expiration the internal intercostle muscles _____ (what happens to ribs

Answer 9

Contracts
Ribs goes back to domed position

Question 10

During expiration the diaphragm _____(what happens to ribs )

Answer 10

Relaxes
The ribs return to domed position

Question 11

During expiration the air pressure in lungs _____

Answer 11

Initially grater than atm
But the drops because air goes out

Question 12

During expiration the lung volume _____

Answer 12

Decreases

Question 13

During expiration how does air move
Air moves ___ of the lungs from ____ pressure in lungs out to atm pressure

Answer 13

Out
High