Q1. Which muscle plays a primary role in increasing the thoracic cavity volume during inspiration?A. DiaphragmB. Abdominal musclesC. Intercostal musclesD. Sternocleidomastoid
Q2. Which of the following statements about the nasal cavity is correct?A. It helps in warming, humidifying, and filtering incoming air.B. It prevents the passage of air into the trachea.C. It is directly connected to the alveoli.D. It plays no role in respiration.
Q3. Which of the following occurs during expiration?A. Diaphragm contractsB. Thoracic volume increasesC. Pulmonary pressure decreasesD. Intercostal muscles relax
Q4. Which structure separates the thoracic cavity from the abdominal cavity?A. PleuraB. DiaphragmC. Intercostal musclesD. Trachea
Q5. Which respiratory volume remains in the lungs even after a forceful expiration?A. Tidal VolumeB. Residual VolumeC. Vital CapacityD. Expiratory Reserve Volume
Q6. Which structure prevents the collapse of alveoli by reducing surface tension?A. Pleural membraneB. SurfactantC. Cartilaginous ringsD. Mucous lining
Q7. What is the approximate number of breaths per minute in a healthy adult?A. 5-8B. 12-16C. 20-25D. 30-35
Q8. Which factor promotes the dissociation of oxyhemoglobin at the tissues?A. High pO₂B. Low pCO₂C. High H⁺ concentrationD. Low temperature
Q9. Which structure prevents the collapse of the trachea during breathing?A. Smooth musclesB. AlveoliC. Cartilaginous ringsD. Pleural fluid
Q10. Which structure in the human respiratory system acts as a protective barrier against foreign particles?A. AlveoliB. EpiglottisC. Nasal chamberD. Diaphragm