Class 11 Biology — Chapter 14: Breathing and Exchange of Gases

What you'll learn

• ▸Respiratory Organs in Animals
• ▸Human Respiratory System Anatomy
• ▸Mechanism of Breathing
• ▸Respiratory Volumes and Capacities
• ▸Exchange of Gases (Diffusion)
• ▸Transport of Oxygen
• ▸Transport of Carbon Dioxide
• ▸Regulation of Respiration
• ▸Disorders of the Respiratory System

Chapter Summary

--- PAGE 1 --- Unit 5 HUMAN PHYSIOLOGY Chapter 14 Breathing and Exchange of Gases Chapter 15 Body Fluids and Circulation Chapter 16 Excretory Products and their Elimination Chapter 17 Locomotion and Movement Chapter 18 Neural Control and Coordination Chapter 19 Chemical Coordination and Integration The reductionist approach to study of life forms resulted in increasing use of physico-chemical concepts and techniques. Majority of these studies employed either surviving tissue model or straightaway cell- free systems. An explosion of knowledge resulted in molecular biology. Molecular physiology became almost synonymous with biochemistry and biophysics. However, it is now being increasingly realised that neither a purely organismic approach nor a purely reductionistic molecular approach would reveal the truth about biological processes or living phenomena. Systems biology makes us believe that all living phenomena are emergent properties due to interaction among components of the sy…

Practice Questions from this Chapter

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1. Explain how lungs get oxygen to blood. Get Solution →
2. Describe how different animals breathe. Get Solution →
3. Illustrate the path air takes in your body. Get Solution →
4. What is the common term for the process of exchanging O₂ from the atmosphere with CO₂ produced by the cells? Get Solution →
5. Which structure in the human respiratory system is also known as the 'sound box'? Get Solution →
6. What is the primary function of the pleural fluid found between the pleural membranes of the lungs? Get Solution →
7. According to the text, what is the average breathing rate for a healthy human? Get Solution →
8. What is the approximate Tidal Volume (TV) during a normal respiration? Get Solution →

Did you know?

• 💡 A human takes over 20,000 breaths daily without conscious thought.
• 💡 Your left lung is slightly smaller than your right to give space for your heart.
• 💡 You lose about half a liter of water daily through the air you exhale.
• 💡 Dolphins must remember to breathe; they do not breathe automatically like humans.
• 💡 Whales have a special ability to hold their breath for up to 90 minutes.

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