passwella.
Menu

JAMB Biology 2003 Question 14

Question 14

Respiration

Use the diagram of the bell jar set-up to answer: The aim of the experiment is to demonstrate

Diagram for this question
  1. A.that in mammals gaseous exchange takes place in the lungs.
  2. B.the part played by the pleural cavity and diaphragm in respiration
  3. C.that a large amount of oxygen is absorbed by the lungs.
  4. D.the presence of carbon(IV) oxide in exhaled air.
Show the answer and explanation

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

Explanation

Pulling the rubber sheet down makes the space in the jar bigger, so the balloons fill with air; pushing it up deflates them. This models how the diaphragm and chest cavity work in breathing.