Breathing and Exchange of Gases

A structured NEET UG study chapter on how oxygen enters the body, reaches the tissues and is used alongside the removal of carbon dioxide. It covers respiratory organs in animals, the human respiratory system, the mechanism and regulation of breathing, respiratory volumes and capacities, gas exchange across the diffusion membrane, transport of oxygen and carbon dioxide, and asthma, emphysema and occupational respiratory disorders. Six graded sets combine NCERT-focused notes, accurate diagrams and single-correct questions with explanations for recall, calculation, comparison and application practice.