Ijmb Model Questions Vol1 2018 Biology Question 4

Practice essay / theory question 4 from the 2018 Ijmb Model Questions Vol1 Biology examination. This question covers respiration, human anatomy, physiology .

Ijmb Model Questions Vol1 2018 Biology Essay / Theory

Topics: respiration human anatomy physiology

Question 4 IJMB_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

The diagram shows the human respiratory system with the structures labelled as follows: trachea (T), primary bronchi (B1), secondary bronchi (B2), bronchioles (Bo), alveolar sacs (A), diaphragm (D), intercostal muscles (IM), pleural cavity (PC) and lungs (L).

Question Parts

( a )

Describe the complete pathway that air follows from the external environment to the site of gas exchange, naming each structure it passes through.

( b )

Explain the mechanism of ventilation, describing the role of the diaphragm and intercostal muscles and how changes in thoracic volume affect intra‑thoracic pressure.

( c )

Given that the partial pressure of oxygen in alveolar air is 100 mmHg and in the pulmonary capillary blood is 40 mmHg, discuss how this gradient influences the rate of diffusion of O₂ according to Fick’s law, and state two pathological factors that could limit this diffusion.

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About This Question

This is Ijmb Model Questions Vol1 2018 Biology Question 4. It is one of the essay questions from the 2018 Ijmb Model Questions Vol1 Biology examination.

The question covers respiration, human anatomy, physiology .

View More Ijmb Model Questions Vol1 2018 Biology Questions More Ijmb Model Questions Vol1 Practice Questions Back to Questions

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