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CAIE Biology A-Level: Topic 9 - Gas Exchange

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CAIE Biology A-Level: Topic 9 - Gas Exchange

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Questions and Answers

What is the primary site of gaseous exchange in humans?

Trachea

Diaphragm

Alveoli (correct)

Bronchi

What is the main function of the alveoli in the mammalian gaseous exchange system?

To warm and humidify the air

To regulate breathing rate

To exchange oxygen and carbon dioxide (correct)

To filter out dust and particles

What is the characteristic of the walls of the alveoli?

Thin and one cell thick (correct)

Thin and three cell thick

Thick and cartilaginous

Thick and muscular

Why is the blood supply to the alveoli important?

To maintain a steep concentration gradient Signup and view all the answers

How many alveoli are present in each lung?

300 million Signup and view all the answers

What happens to the oxygen concentration in the alveoli during inspiration?

It increases Signup and view all the answers

In which direction does oxygen diffuse across the alveolar and capillary wall?

From alveoli to blood Signup and view all the answers

What is the direction of carbon dioxide diffusion?

From blood to alveoli Signup and view all the answers

What is the driving force behind the diffusion of oxygen and carbon dioxide?

Passive diffusion Signup and view all the answers

What is the result of the steep concentration gradient maintained by the blood movement in the alveoli?

Faster diffusion of gases Signup and view all the answers