Igcse Model Questions Vol1 2020 Biology Question 4

Practice essay / theory question 4 from the 2020 Igcse Model Questions Vol1 Biology examination. This question covers respiration .

Igcse Model Questions Vol1 2020 Biology Essay / Theory

Topic: respiration

Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

Igcse Model Questions Vol1 2020 Biology Question 4 diagram

The labelled diagram illustrates the main structures of the human respiratory system.

Question Parts

( a )

Identify the structures represented by labels A, B, C, D, E, F, G and H.

( b )

Describe, using the diagram, the complete pathway that a breath of air follows from entry into the nose to reaching the alveolar sac.

( c )

Explain the muscular actions shown in the diagram that produce inhalation and exhalation, mentioning the role of the diaphragm and intercostal muscles.

( d )

Using the diagram, discuss how oxygen and carbon dioxide are exchanged between the alveolar sac (G) and the blood, referring to the relevant partial pressure gradients.

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About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 4. It is one of the essay questions from the 2020 Igcse Model Questions Vol1 Biology examination.

The question covers respiration .

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