Biology · Class 11 · Chapter 14
Breathing and Exchange of Gases
11 lessons 81 min 1 simulations 10 practice questions
This chapter follows oxygen from the air into the cells and carbon dioxide back out. It covers respiratory organs across animal groups, the human respiratory tract, the pressure changes that move air in and out, lung volumes, gas exchange by diffusion, the carriage of O₂ and CO₂ in blood, the neural control of breathing, and a few common disorders.
What the exam asks
NEET questions from this chapter centre on respiratory volume and capacity arithmetic, partial pressure values, the percentages of O₂ and CO₂ carried by each route, the conditions that favour oxyhaemoglobin formation or dissociation, and the roles of the medulla, pons and chemoreceptors. Students typically lose marks by adding the wrong volumes for a capacity, by reversing the pressure logic of inspiration, and by overstating the role of O₂ in regulating breathing.
Lessons
11 lessons · 81 min
1Respiratory organs in animalsNCERT §14.16 min2Human respiratory systemNCERT §14.1.16 min3Steps of respirationNCERT §14.1.16 min4Mechanism of breathingNCERT §14.26 min5Respiratory volumes and capacitiesNCERT §14.2.17 min6Exchange of gasesNCERT §14.37 min7Transport of oxygenNCERT §14.4, §14.4.111 min 1 sim8Transport of carbon dioxideNCERT §14.4, §14.4.27 min9Regulation of respirationNCERT §14.57 min10Disorders of the respiratory systemNCERT §14.66 min11Chapter reviewMust-know facts, traps and formulas12 min