Resp Physiology

Question 1

Volume inspired or expired with each breath at rest

Answer 1

Tidal Volume

Question 2

Normal Tidal volume

Answer 2

500ml in males, 350ml in females

Question 3

maximum volume of air that can be inspired at the end of a normal tidal inspiration

Answer 3

Inspiratory reserve volume (IRV) = 2-3 L

Question 4

Inspiratory reserve volume (IRV) + Tidal Volume (TV) = ?

Answer 4

inspiratory capacity = TV + IRV

Question 5

Maximum volume of air that can be expired at the end of a normal tidal expiration

Answer 5

Expiratory Reserve Volume (ERV) 750ml

Question 6

Why is Expiratory Reserve Volume (ERV) reduced in obese patients?

Answer 6

increased abdominal fat mass pushes up against the diaphragm

=> reducing the volume of air that can be expelled

Question 7

Volume of air remaining after maximal expiration
(increases with age)

Answer 7

Residual volume (RV) = 1.2L

Question 8

Functional residual capacity (FRC) - Expiratory Reserve Volume (ERV) = ?

Answer 8

Residual Volume = FRC - ERV

Question 9

the volume in the lungs at the end-expiratory position

Answer 9

Functional Residual Capacity

Question 10

Maximum volume of air that can be expired after a maximal inspiration

Answer 10

Vital Capacity (VC)

Question 11

Normal Vital Capacity

Answer 11

4,500ml in males
3,500 mls in females

NOTE: decreases with age

Question 12

inspiratory capacity + ERV = ?

Answer 12

Vital Capacity (VC) - IC + ERV

Question 13

vital capacity (VC) + residual volume (RV) = ?

Answer 13

Total Lung capacity = VC + RV

Question 14

What does VD represent?

Answer 14

Physiological dead space

VD = tidal volume * (PaCO2 - PeCO2) / PaCO2