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BIOLOGY

JAMB 2003 - Question 14

Biology 2003 JAMB Past Questions - Question 14: The aim of the experiment is to demonstrate

use the diagram below to answer the questions 14 and 15

The aim of the experiment is to demonstrate

A: that in mammals gaseous exchange takes place in the lungs.

B: the part played by the pleural cavity and diaphragm in respiration

C: that a large amount of oxygen is absorbed by the lungs.

D: the presence of carbon(IV) oxide in exhaled air.

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Correct Answer

Explanation

The diagram represents what happens during inspiration. The pillar muscles o f diaphragm contract to flatten the diaphragm from its dome shaped position and in this way increases the volume of the thoracic cavity while the pressure decreases. Airbrushes into the lungs.