Gaseous Exchange in Humans – 25 Most Important MCQs with Answers Preparing for MDCAT, PPSC, and other competitive exams ? Here are the 25 most repeated MCQs on Gaseous Exchange in Humans with correct answers to help you revise quickly. MCQs on Gaseous Exchange in Humans 1. Site of gaseous exchange in human lungs is: A) Bronchi B) Bronchioles C) Alveoli ✅ D) Trachea 2. Which structure increases the surface area for gaseous exchange? A) Alveoli ✅ B) Bronchi C) Pleura D) Diaphragm 3. Main muscle involved in inspiration is: A) Diaphragm ✅ B) Intercostal muscles C) Abdominal muscles D) Sternum 4. Oxygen transport in blood is mainly through: A) Plasma B) Hemoglobin ✅ C) WBC D) Platelets 5. Normal breathing rate in adults at rest is: A) 6–8 per minute B) 12–18 per minute ✅ C) 20–25 per minute D) 30–35 per minute 6. The process of taking in oxygen and releasing carbon dioxide is called: A) Respiration ✅ B) Photosynthesis C) Excretion D) Digestion ...
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