| | Key Points | NEET PYQ Trend | |-------------|----------------|---------------------| | Nasal cavity | Warms, filters, moistens air | Often asked: function of conchae | | Pharynx → Larynx | Common passage; glottis & epiglottis | MCQs on swallowing vs breathing | | Trachea → Bronchi → Bronchioles | C-shaped cartilage rings; surfactant in alveoli | High yield: role of surfactant | | Alveoli | Site of gas exchange; Type II cells produce surfactant | PYQ: deficiency → respiratory distress | | Mechanism of breathing | Diaphragm contraction → inspiration; relaxation → expiration | Numerical on tidal volume, vital capacity | | Transport of O₂ | 97% by Hb; oxyhemoglobin dissociation curve | Graph-based Qs: Bohr effect | | Transport of CO₂ | 70% as bicarbonate; chloride shift | Assertion-reason Qs |
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