Respiration pathway — arrange airflow and oxygen transfer steps correctly: A) Lung B) Nostrils C) Windpipe D) Blood

Introduction / Context:Trace the path of inhaled air to oxygen transfer into blood.

Given Data / Assumptions:Nostrils → Windpipe (trachea) → Lung → Blood (via alveoli).

Concept / Approach:Follow anatomical route of air and diffusion.

Step-by-Step Solution:Nostrils (B) admit air.Windpipe (C) conducts air to lungs.Lung (A) houses alveoli.Blood (D) receives O2 across alveolar membranes.

Verification / Alternative check:Basic physiology confirms this pathway.

Why Other Options Are Wrong:They misorder anatomical structures or start with blood.

Common Pitfalls:Confusing trachea with esophagus.

Final Answer:B, C, A, D