Inspiration & Expiration.

Question 1

Inspiration

Answer 1

(Active); Diaphragm pushes downward, ribs lift upward, Volume of lungs increases, Intrapulmonary pressure lowered (less than atmosphere)

Question 2

Expiration

Answer 2

(Mostly Passive, Active during Exercise); Diaphragm relaxes, ribs pulled downward, Volume of lungs decreases, Intrapulmonary pressure raised (greater than atmosphere)

Question 3

Intrapulmonary Pressure

Answer 3

Pressure in the lungs; Allows inspiration to occur since this pressure can be reduced below atmospheric pressure, Expiration occurs when the pressure within the lungs exceeds atmospheric pressure

Question 4

Intrapleural Pressure

Answer 4

Less than atmospheric (Important because it prevents the collapse of fragile air sacs/alveoli); Becomes even lower during inspiration which causes air from the environment to move into the lungs

Question 5

Visceral Pleura

Answer 5

Adheres to the outer surface of the lung

Question 6

Parietal Pleura

Answer 6

Lines the thoracic walls

Question 7

Pressure Values at Rest

Answer 7

Intrapulmonic= 760 mmHg, Intrapleural= 756 mmHg

Question 8

Pressure Values during Inspiration

Answer 8

Intrapulmonic= 758 mmHg, Intrapleural= 754 mmHg

Question 9

Pressure Values during Expiration

Answer 9

Intrapulmonic= 763 mmHg, Intrapleural= 756 mmHg