Breathing and Exchange of Gases: NEET questions with solutions

This chapter tests the mechanics of breathing (pressure-driven inspiration and expiration), the exchange and transport of O₂ and CO₂, respiratory volumes and capacities, and the neural regulation of breathing. NEET marks are frequently lost on respiratory-volume arithmetic, on the relative solubility/transport share of O₂ versus CO₂, and on confusing look-alike respiratory disorders.

1. 1.Which one of the following correctly gives the sequence of passages through which inhaled air travels, from the external nostrils to the…Respiratory organs — human respiratory systemEasySingle correct
2. 2.The larynx, commonly called the sound box, lies between the pharynx and the trachea. Which of the following correctly describes a key…Respiratory organs — larynxEasySingle correct
3. 3.During a normal, quiet inspiration in humans, contraction of the diaphragm and the external intercostal muscles brings about a pressure…Mechanism of breathingMediumSingle correct
4. 4.For an adult, take Tidal Volume (TV) = 500 mL, Inspiratory Reserve Volume (IRV) = 2500 mL and Expiratory Reserve Volume (ERV) = 1000 mL…Respiratory volumes and capacitiesMediumSingle correct
5. 5.Efficient gas exchange at the alveoli depends on the properties of the gases themselves as well as on the structure of the membrane they…Exchange of gasesMediumStatement based
6. 6.Read the following two statements about the transport of oxygen in human blood and choose the option that correctly evaluates them.Transport of gases — oxygenMediumStatement based
7. 7.Only a small fraction of the CO₂ produced by tissues travels dissolved in plasma. Which of the following correctly describes how most CO₂ is…Transport of gases — carbon dioxideHardSingle correct
8. 8.Breathing rate is adjusted moment to moment by chemical signals reaching the medulla, not by mechanical stretch alone. Evaluate the…Regulation of respirationHardAssertion–Reason
9. 9.Emphysema is a chronic respiratory disorder commonly caused by long-term cigarette smoking. Which of the following correctly describes what…Disorders of the respiratory systemEasySingle correct
10. 10.Workers in industries involving grinding or stone-breaking are exposed over years to excessive dust in their workplace. What kind of…Disorders of the respiratory systemMediumSingle correct