Question

which of the following is a correct path of air through the respiratory tract? select all that apply.
check all that apply
nose to pharynx to larynx to trachea
nose to larynx to pharynx to trachea
trachea to main bronchi to bronchioles to terminal bronchioles
trachea to main bronchi to respiratory bronchioles to terminal bronchioles
terminal bronchioles to respiratory bronchioles to alveolar duct to alveolar sac

Explanation:

• The respiratory tract's correct air - flow path:
• Nasal cavity (nose): Air enters here.
• Pharynx: A common passage for air and food.
• Larynx: Prevents food from entering the trachea.
• Trachea: Conducts air to the lungs.
• Main bronchi: Branch off from the trachea.
• Bronchioles: Further branching of the bronchi.
• Terminal bronchioles: Smallest conducting bronchioles.
• Respiratory bronchioles: Start of gas - exchange regions.
• Alveolar ducts and sacs: Sites of gas exchange.
• Analyzing each option:
• Option 1 (nose to pharynx to larynx to trachea): Correct as per the initial air - entry and conduction path.
• Option 2 (nose to larynx to pharynx to trachea): Incorrect because the pharynx is before the larynx in the normal air - flow.
• Option 3 (trachea to main bronchi to bronchioles to terminal bronchioles): Correct as it follows the bronchial branching pattern (trachea → main bronchi → bronchioles → terminal bronchioles).
• Option 4 (trachea to main bronchi to respiratory bronchioles to terminal bronchioles): Incorrect. The terminal bronchioles come before the respiratory bronchioles in the conducting - to - respiratory transition.
• Option 5 (terminal bronchioles to respiratory bronchioles to alveolar duct to alveolar sac): Correct as it represents the transition from conducting (terminal bronchioles) to respiratory (respiratory bronchioles) and then to gas - exchange structures (alveolar duct and sac).

Answer:

nose to pharynx to larynx to trachea, trachea to main bronchi to bronchioles to terminal bronchioles, terminal bronchioles to respiratory bronchioles to alveolar duct to alveolar sac