The nurse uses a diagram to show that when the diaphragm moves:
A) up, the increased negative pressure in the thoracic space forces air into the lungs.
B) down, the intercostal muscles retract, forcing air out of the lungs.
C) down, the negative pressure in the thoracic space pulls air into the lungs.
D) up, the decreased negative pressure allows air to enter the lungs.

Question

Quizplus · Accepted Answer

When the diaphragm moves down, increasing the size of the thoracic space, air is pulled into the lungs. The respiratory action is controlled by the spinal cord.

The Nurse Uses a Diagram to Show That When the Diaphragm