Identify Lung Volume/capacities: Tidal Volume, Vital Capacity, Residual Volume

Question 1

What is lung volume? How does max lung volume occur?

Answer 1

Lung volume is the maximum amount of air that has filled the lungs.
This happens when the movement of the rib cage and flattening of the diaphragm causes an increase in lung volume. This causes a drop in airway pressure.
Air rushes in to fill the vacuum
This causes lungs to expand
Once the max amount of air has filled lungs it’s now the lung volume .

Question 2

What are the two different ways of measuring how much air can move into and out of the lung?

Answer 2

1. Tidal volume
2. Functional residual capacity

Question 3

What is tidal volume ?

Answer 3

The amount of air that moves into the lungs in one single respiratory cycle (inspiration and expiration).

Question 4

What is functional residual capacity ?

Answer 4

The amount of air left in the lungs at the end of expiration. This air the what stops the alveoli from collapsing at the end of expiration.

Question 5

What is inspiratory reserve volume?

Answer 5

The extra volume of air over and above normal tidal volume that can be inhaled into the lungs during maximal inspiration.

Question 6

What is inspiratory capacity?

Answer 6

The amount of air that can be inspired with maximum effort. It consists of the tidal volume + the inspiratory reserve volume

Question 7

What is expiratory reserve volume?

Answer 7

The additional volume of air that can be expelled over and above the normal tidal volume during maximal expiration .