First slide

Human Respiratory System

Question

Select the correct statement.

Easy

A

The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber
B

The thoracic chamber is formed ventrally by the vertebral column
C

Positive pressure breathing occurs in humans
D

We can directly alter the pulmonary volume

Solution

The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber.
The thoracic chamber is formed dorsally (not ventrally) by the vertebral column.
Negative pressure breathing occurs in humans. Contraction of the diaphragm and the external intercostal pressure creates a negative pressure (vacuum) in the lungs that draws air from the atmosphere.
We cannot directly alter the pulmonary volume.

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