CRE Respiratory System Anatomy & Physiology 2

Question 1

Which cells lining the bronchial tree produce mucus that traps inhaled particles?

Accepted Answer

Goblet cells

Answer

Goblet cells are mucus-secreting epithelial cells found throughout the bronchial tree that help trap and remove inhaled debris.

Question 2

The functional residual capacity (FRC) is the sum of which two lung volumes?

Accepted Answer

Expiratory reserve volume + residual volume

Answer

FRC equals expiratory reserve volume plus residual volume, representing the gas remaining in the lungs after a normal passive exhalation.

Question 3

Surfactant is produced primarily by which pulmonary cell type?

Accepted Answer

Type II pneumocytes

Answer

Type II pneumocytes synthesize and secrete surfactant, a phospholipid mixture that reduces alveolar surface tension and prevents collapse.

Question 4

During inspiration, intrapleural pressure typically changes from approximately −5 cmH₂O to:

Accepted Answer

−8 cmH₂O

Answer

During a normal tidal breath, intrapleural pressure drops from about −5 to −8 cmH₂O, creating the pressure gradient that drives airflow into the lungs.

Question 5

Which muscle is the PRIMARY muscle of inspiration during quiet breathing?

Accepted Answer

Diaphragm

Answer

The diaphragm accounts for approximately 70–80% of the work of quiet inspiration by contracting and descending to increase thoracic volume.

(CRE) Certified Respiratory Educator Practice Test

(CRE) Certified Respiratory Educator Practice Test

CRE Respiratory System Anatomy & Physiology 2