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Wednesday 22 May 2024

Biology MCQs Part 28 | NTS Biology MCQs With Answer

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10.3) Gaseous Exchange in Humans

261.     What is the process of taking in air called?

             (A) Expiration

             (B) Exhalation

             (C) Inspiration 

             (D) Ventilation

262.     What causes the ribcage to expand during inspiration?**

             (A) Relaxation of intercostal muscles

             (B) Contraction of intercostal muscles 

             (C) Relaxation of diaphragm

             (D) Flattening of alveoli

263.   During which phase does the diaphragm become dome-shaped?**

             (A) Inspiration

             (B) Expiration 

             (C) Both inspiration and expiration

             (D) Neither

264.     What happens to air pressure in the lungs during inspiration?**

             (A) Increases

             (B) Decreases 

             (C) Remains the same

             (D) Fluctuates

265.     Where does gas exchange primarily occur in the lungs?**

             (A) Bronchi

             (B) Trachea

             (C) Alveoli 

             (D) Pleura

266.     What happens to the volume of the chest cavity during expiration?**

             (A) Increases

             (B) Decreases 

             (C) Remains constant

             (D) Expands

267.     Which gas diffuses from the blood into the alveoli?**

              (A) Oxygen

             (B) Nitrogen

             (C) Carbon dioxide 

             (D) Helium

268.     What initiates the movement of air into the lungs?**

             (A) Lower pressure in the lungs than outside 

            (B) Higher pressure in the lungs than outside

            (C) Relaxation of intercostal muscles

            (D) Flattening of the diaphragm

269.     What happens to the blood in the capillaries around the alveoli?**

             (A) It loses oxygen

              (B) It gains carbon dioxide

             (C) It gains oxygen 

             (D) It remains unchanged

270.     What is the role of the diaphragm during breathing?**

             (A) It controls the flow of blood

             (B) It helps in the expansion and contraction of the chest cavity 

             (C) It filters air entering the lungs

             (D) It supports the lungs

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