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Syllabus

Breathing and Exchange of Gases — Syllabus

CBSE · Class 11 · Biology

What Breathing and Exchange of Gases covers in CBSE Class 11 Biology: 4 topics, for the 2026-27 session. Part of the CBSE Class 11 Biology syllabus.

101 questions66 flashcards3 formulas & key relations5 concepts

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4 Topics · CBSE Class 11 Biology · 2026-27

Topics in Breathing and Exchange of Gases

1

Respiratory Organs and Air Passage

  • The human respiratory system has a conducting part and a respiratory or exchange part.
  • The conducting part extends from the external nostrils up to the terminal bronchioles.
  • The respiratory or exchange part includes the alveoli and their ducts.
2

Mechanism of Breathing

  • Breathing has two stages: inspiration and expiration.
  • Inspiration is the entry of air into the lungs.
  • Expiration is the release of alveolar air out of the lungs.
3

Respiratory Volumes and Capacities

  • Tidal Volume is the volume of air inspired or expired during normal respiration.
  • Tidal Volume is approximately 500 mL.
  • Inspiratory Reserve Volume is the extra air inspired by forcible inspiration.
4

Exchange of Gases

  • Alveoli are the primary sites of exchange of gases.
  • Gas exchange also occurs between blood and tissues.
  • Oxygen and carbon dioxide move by simple diffusion.

Key Concepts

Central concept: Breathing and exchange of gases in humans

Respiratory organsConducting part of respiratory systemRespiratory or exchange partMechanism of breathingRespiratory volumes and capacitiesExchange of gasesTransport of gasesTransport of oxygen

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Frequently Asked Questions

What are the important topics in Breathing and Exchange of Gases for CBSE Class 11 Biology?
Key topics in Breathing and Exchange of Gases include Respiratory Organs and Air Passage, Mechanism of Breathing, Respiratory Volumes and Capacities, Exchange of Gases. Study these first, then practise questions on each for Class 11 exams.
How should I revise Breathing and Exchange of Gases for Class 11 exams?
Learn the core ideas first, then work through the 101 practice questions on Breathing and Exchange of Gases. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All CBSE Class 11 Biology Syllabus

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