Structures and organization of respiration 16.2

Question 1

What is pulmonary ventilation?

Answer 1

The flow of air between the atmosphere and the lungs, occurs due to difference in air pressure

Question 2

What is the main muscle of inhalation and exhalation?

Answer 2

Diaphragm

Question 3

What shape does the diaphragm take when it is contracted?

Answer 3

It flattens as it contract

Question 4

What % of air is brought into the lungs via the diaphragm?

Answer 4

75%

Question 5

Define exhalation:

Answer 5

Exhalation occurs due to elastic recoil of the chest wall and lungs
-During exhalation alveoli and airways don’t completely collapse due to this recoil effect and presence of surfactant

Question 6

What are the muscles of exhalation

Answer 6

internal intercostal 
external oblique
Internal Oblique
Transverse abdominis
Rectus Abdominis

Question 7

When inhaling air, is the alveolar pressure lower or higher?

Answer 7

The pressure in the alveoli decreases

Question 8

When exhaling, is the alveolar pressure increased or decreased?

Answer 8

The pressure is increased

Question 9

When is lung pressure the same as the atmospheric pressure?

Answer 9

At rest just before inhalation