Biology Respiration / Gaseous Exchange MDCAT 2018
PMDC Verified Question 22 of 34
During breathing air from pharynx enters to:
A
Alveoli
B
Trachea
C
Bronchioles
D
Bronchi
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Trachea
Concept: The pathway of airflow must be understood sequentially from the external environment to the site of gas exchange.

Solution:
  • When air is inhaled, it travels through the nasal cavity \( \rightarrow \) pharynx \( \rightarrow \) larynx \( \rightarrow \) trachea.
  • From the trachea, it bifurcates into the left and right bronchi, which further subdivide.
  • Because the larynx is not listed in the options, the trachea is the immediate next major respiratory structure the air enters after the pharynx.


Why other options are incorrect:
  • Alveoli, Bronchi, Bronchioles: These structures are located much deeper in the respiratory tract and receive air only after it has passed through the trachea.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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