Respiratory Adaptations: Altitude and Diving · NCERT Biology

Which adaptation improves oxygen diffusion in high-altitude lungs?

  1. Thicker alveolar walls
  2. Reduced capillary network
  3. Increased capillary density
  4. Lower surface area of alveoli
Show answer and explanation

Correct answer: Increased capillary density

Increased capillary density enhances oxygen diffusion into blood. This compensates for low oxygen pressure at high altitudes.

Difficulty: Medium Question 14 of 20

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