Ventilation and Compliance

Question 1

What is the TV and what does it measure?

Answer 1

Tidal Volume; Volume of air breathed in and out of the lungs at each breath. (About 500ml)

Question 2

What is the ERV and what does it measure?

Answer 2

Expiration Reserve Volume= Max vol of air that can be expelled at the end of a normal expiration.

Question 3

What is the IRV and what does it measure?

Answer 3

Inspiratory reserve volume= Max vol that can be inspired in a normal breath.

Question 4

What is RV and what does it measure?

Answer 4

Residual Volume= Volume of air in lungs at end of maximal expiration.

Question 5

What is VC and what does it measure?

Answer 5

Vital Capacity= Tidal volume + inspiratory reserve + expiratory reserve volume

Question 6

What is IC and what does it measure?

Answer 6

Inspiratory Capacity = Tidal vol+ inspiratory volume

Question 7

What is anatomical dead space?

Answer 7

150ml- is volume of gas in conducting airways and not available for exchange.

Question 8

What does hyperventilation do to gases?

Answer 8

Increases O2

Decreases CO2

Question 9

What does hyporventilation do to gases

Answer 9

Decreases O2

Increases CO2

Question 10

Why do we have surfactant?

Answer 10

Air inside alveoli is saturated (max water content)
Droplets like to stick together (rain on window)
This causes inward pressure.
Surfactant reduces this by getting in the way

Question 11

Why is surfactant more efeextive in smaller alveoli?

Answer 11

Its more concentrated

Question 12

How do you measure alveolar ventilation?

Answer 12

(Tv-150ml) multiplied by No of breaths per min