Waec Model Questions Vol1 2023 Biology Question 4

Practice essay / theory question 4 from the 2023 Waec Model Questions Vol1 Biology examination. This question covers respiration, human anatomy, gas exchange .

Waec Model Questions Vol1 2023 Biology Essay / Theory
Topics: respiration human anatomy gas exchange
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay
Waec Model Questions Vol1 2023 Biology Question 4 diagram

The diagram shows a labelled illustration of the human respiratory system, including the external nose, pharynx, larynx, trachea, primary bronchi, bronchioles, alveolar sacs and the diaphragm in both contracted and relaxed positions.

Question Parts

( a )
Describe, in the correct order, the pathway that a breath of air follows from the external environment to the site of gas exchange, naming each structure it passes through.
( b )
Explain the mechanism of gas exchange that occurs in the alveolar‑capillary membrane, stating the role of partial pressure gradients of oxygen and carbon dioxide.
( c )
Using the diagram, describe how the movement of the diaphragm during contraction and relaxation alters thoracic volume and intra‑thoracic pressure, and how these changes facilitate inhalation.
( d )
A student records that the volume of oxygen consumed during moderate exercise is 30 % higher than at rest. Discuss two physiological adaptations of the respiratory system that occur during exercise and could account for this increase.

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About This Question

This is Waec Model Questions Vol1 2023 Biology Question 4. It is one of the essay questions from the 2023 Waec Model Questions Vol1 Biology examination.

The question covers respiration, human anatomy, gas exchange .

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