IB MYP Integrated Sciences e-Assessment : Respiration Exam Style Practice Questions - New Syllabus

Question (2 mark)

Select the correct location to show the path of an oxygen molecule $\left(\mathrm{O}_2\right)$ through the respiratory system.

▶️Answer/Explanation

Ans:

Nose: Oxygen enters through the nose (or mouth).
Trachea: It travels down the trachea (windpipe).
Lungs: The trachea branches into the lungs.
Bronchi: Within the lungs, it goes through the bronchi.
Alveoli: Finally, it reaches the alveoli where gas exchange occurs.