Respiratory Physiology

Question 1

What are the 4 stages of external respiration?

Answer 1

Ventilation
Gas exchange
Gas transport
Tissue gas exchange

Question 2

What is Boyle’s Law?

Answer 2

As the volume of a gas increases, the pressure exerted by the gas decreases

Question 3

What 2 forces hold the thoracic wall together?

Answer 3

Intrapleural fluid cohesiveness

Negative intrapleural pressure

Question 4

What is La Place’s Law?

Answer 4

P = 2T/r

Meaning that smaller alveoli have a higher tendancy to collapse

Question 5

What do alveolar II cells secrete?

Answer 5

Surfactant (lipids and proteins)

Question 6

What is tidal volume? (TV)

Answer 6

Volume of air entering or leaving the lungs during a single breath. (500ml)

Question 7

What is inspiratory reserve volume? (IRV)

Answer 7

Extra volume of air that can be maximally inspired over and above the typical TV (3000ml)

Question 8

What is inspiratory capacity? (IR)

Answer 8

Maximum volume of air that can be inspired at the end of a normal quiet expiration (3500ml)

Question 9

What is expiratory reserve volume? (ERV)

Answer 9

Extra volume of air that can be actively expired by maximal concentration beyond the normal volume of air after a resting TV. (1000ml)

Question 10

What is residual volume? (RV)

Answer 10

Minimum volume of air in lungs even after a maxima expiration (1200ml)

Question 11

What is the functional residual capacity (FRC)

Answer 11

Volume of air in lungs at end of normal passive expiration (2200ml)

Question 12

What is vital capacity? (VC)

Answer 12

Maximum volume of air that can be moved out during a single breath following a maximal inspiration (4500ml)

Question 13

What is the total lung capacity? (TLC)

Answer 13

Maximal volume of air that the lungs can hold (5700ml)

Question 14

What is the FEV1?

Answer 14

Volume of air that can be expired during the 1st second of expiration in an FVC.