Question

How would paralysis of the diaphragm alter inspiration?

a. It would prevent contraction of the intercostal muscles.

b. It would prevent inhalation because the intrapleural pressure would not change.

c. It would decrease the intrapleural pressure and allow more air to enter the lungs.

d. It would slow expiration because the lung would not relax.

Short answer

The correct answer is (b) It would prevent inhalation because the intrapleural pressure would not change.

Step-by-step solution

Step 1. Introduction

Diaphragm paralysis is the loss of control of one or both sides of the diaphragm. This causes a reduction in lung capacity. Patients with diaphragm paralysis may experience shortness of breath, headaches, blue lips and fingers, fatigue, insomnia, and overall breathing difficulty.

Step 1. Explanation for the correct answer

(b) It would prevent inhalation because the intrapleural pressure would not change

• Paralysis of the diaphragm would prevent inhalation because the intrapleural pressure would not change.

• The diaphragm can't contract and go down to decrease the pressure that allows the inhalation process to happen.

Step 3. explanation for the incorrect answer

a. It would prevent contraction of the intercostal muscles.

• Paralysis of the diaphragm would prevent inhalation because the intrapleural pressure would not change. Not because it would prevent contraction of the intercostal muscles. Hence this is not the correct option.

c. It would decrease the intrapleural pressure and allow more air to enter the lungs.

• Paralysis of the diaphragm would prevent inhalation because the intrapleural pressure would not change. Not because it would decrease the intrapleural pressure and allow more air to enter the lungs. Hence this is not the correct option.

d. It would slow expiration because the lung would not relax.

• Paralysis of the diaphragm would prevent inhalation because the intrapleural pressure would not change. Not because it would It would slow expiration because the lung would not relax. Hence this is not the correct option.