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HESI LPN · HESI LPN Medical Surgical Nursing · HESI Questions of Respiratory System

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

Which of the following does not stimulate the medullary breathing center chemosensitive neurons?

A. low blood pH

B. low blood oxygen

C. high blood carbon dioxide

D. high spinal fluid acidity

Expert Explanatory Rationale

Correct Answer: low blood oxygen

Question 2 of 5

The _____ muscles assist the diaphragm in changing the volume of the thoracic cavity by elevating and lowering the rib cage.

A. Diaphragm

B. Accessory

C. Pleural fluid

D. Intercostal

Expert Explanatory Rationale

Correct Answer: Intercostal

Question 3 of 5

An emergency room nurse is assessing a male client who has sustained a blunt injury to the chest wall. Which of these signs would indicate the presence of a pneumothorax in this client?

A. A low respiratory rate.

B. Diminished breath sounds.

C. The presence of a barrel chest.

D. A sucking sound at the site of injury.

Expert Explanatory Rationale

Correct Answer: Diminished breath sounds.

Question 4 of 5

How many molecules of oxygen (OÃ¢â€šâ€š) can each hemoglobin molecule carry?

A. One molecule

B. Two molecules

C. Three molecules

D. Four molecules

Expert Explanatory Rationale

Correct Answer: Four molecules

Question 5 of 5

The right lung has _____ secondary bronchi and the left lung has _____ secondary bronchi.

A. 2; 2

B. 2; 3

C. 3; 2

D. 3; 3

Expert Explanatory Rationale

Correct Answer: 3; 2

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