lung definitions Flashcards

1
Q

Residual Volume

A

Air volume remaining in the lungs after maximal forced expiration.

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2
Q

FRC (Functional Residual Capacity)

A

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

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3
Q

IRV (Inspiratory Reserve Volume)

A

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

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4
Q

Expiratory Reserve Volume (ERV)

A

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

OPPOSITE OF PSYCHOLOGICAL SIGH

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5
Q

FVC (Forced Vital Capacity)

A

The volume of air maximally exhaled, after a maximum inspiration

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6
Q

Forced expiraoty volume 1

A

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

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7
Q

FEV1 /FVC

A

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.

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8
Q

Closing capacity

A

closing volume + residual volume

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9
Q

what is V, Q,
what is a VQ mismatch

A

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

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