lung definitions

Question 1

Residual Volume

Answer 1

Air volume remaining in the lungs after maximal forced expiration.

Question 2

FRC (Functional Residual Capacity)

Answer 2

Functional residual capacity is the volume of air remaining in the lungs after expiration of a normal breath. RV + ERV

Question 3

IRV (Inspiratory Reserve Volume)

Answer 3

The extra volume of air that can be inspired with a maximal effort after a normal inspiration (psychological sigh)

Question 4

Expiratory Reserve Volume (ERV)

Answer 4

Extra volume of air that can be forcefully expired after normal, quiet expiration

OPPOSITE OF PSYCHOLOGICAL SIGH

Question 5

FVC (Forced Vital Capacity)

Answer 5

The volume of air maximally exhaled, after a maximum inspiration

Question 6

Forced expiraoty volume 1

Answer 6

fraction of the vital capacity expired during the 1st second of forced expiration

Question 7

FEV1 /FVC

Answer 7

ratio of the forced expiratory lung volume in the first second to the forced vital capacity of the lungs. indicates how much air you can forcefully exhale.

Question 8

Closing capacity

Answer 8

closing volume + residual volume

Question 9

what is V, Q,
what is a VQ mismatch

Answer 9

V = ventilation -> amount of air entering the alveoli

Q = perfusion -> blood flowing through capillaries surrounding the alveoli

V/Q mismatch occurs when this ratio is not properly matched (above or below 0.8)
There are 2 types of mismatch:

1.Dead space ventilation – an area that has adequate ventilation but inadequate perfusion (O2 can’t enter the blood stream)
2.Shunt – adequate blood flow (perfusion), but not enough ventilation