Respiratory System Multiple Choice Questions

Which structure prevents food from entering the lungs during swallowing?

• Trachea

• Epiglottis

• Larynx

• Pharynx

What is the primary function of Type II alveolar cells?

• Gas exchange

• Detecting airborne particles

• Producing pulmonary surfactant

• Supporting capillary structure

What type of epithelium lines the nasal cavity?

• Stratified squamous epithelium

• Simple cuboidal epithelium

• Pseudostratified columnar ciliated epithelium

• Transitional epithelium

Which law explains the inverse relationship between pressure and volume during breathing?

• Charles' Law

• Dalton's Law

• Henry's Law

• Boyle’s Law

What is the approximate thickness of the respiratory membrane?

• 1 mm

• 0.5 mm

• 0.5 µm

• 5 µm

Which part of the brainstem contains the respiratory control centres?

• Cerebellum

• Medulla and pons

• Thalamus

• Hypothalamus

What is the primary muscle responsible for inspiration?

• Rectus abdominis

• Pectoralis major

• Diaphragm

What is the role of pulmonary surfactant in the lungs?

• To increase surface tension

• To reduce surface tension

• To absorb oxygen

• To lubricate the pleura

Which component of the respiratory system is responsible for amplifying the voice?

• Trachea

• Larynx

• Nasal cavity

• Alveoli

What is the primary stimulus for breathing in healthy individuals?

• Low oxygen levels

• High oxygen levels

• High carbon dioxide levels

• Low nitrogen levels