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AIIMS 201827 May
Exam
AIIMS
Year
2018
Date
27 May
Subject
Zoology
Chapter
Breathing and Exchange of Gases

AIIMS 2018 · 27 May · Zoology · Breathing and Exchange of Gases

The ventilation movements of the lungs in mammals are governed by

The ventilation movements of the lungs in mammals are governed by

Options

  1. Amuscular walls of lung
  2. Bdiaphragm
  3. Ccostal muscles
  4. Dboth (b) and (c).

Correct answer

D. both (b) and (c).

Step-by-step solution

Ventilation is the movement of air through the conducting passages between the atmosphere and the lungs. The air moves through the passage because of pressure gradients that are produced by contraction and relaxation of diaphragm and intercostal muscles during inspiration and expiration.
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