iGCSE Biology (0610)-11.1 Gas exchange in humans – iGCSE Style Questions Paper 2

Question

The diagram illustrates changes in air pressure taking place inside the lungs during a complete
        cycle of breathing. Atmospheric pressure is 101 kPa.
        At which point on the diagram are the ribs beginning to be lowered?

           

Answer/Explanation

Ans

A

Question

What helps oxygen to be absorbed rapidly into the blood in the lungs?
        A Air breathed in has less oxygen than air breathed out.
        B Alveoli have thick walls and a large surface area.
        C Alveoli have thin walls and a large surface area.
        D The concentration of oxygen in the blood is higher than in the alveoli.

Answer/Explanation

Ans

C

Question

During exercise, receptors detect a change in the blood and cause the breathing rate to increase.
      What change do the receptors detect and where are they found in the body?

       

Answer/Explanation

Ans

A

Question

Which row shows the features of the gas exchange surface in humans?

Answer/Explanation

Ans
B

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