Neco Model Questions Vol1 2025 Biology Question 4

Practice essay / theory question 4 from the 2025 Neco Model Questions Vol1 Biology examination. This question covers human respiration, respiratory anatomy, ventilation, gas exchange .

Neco Model Questions Vol1 2025 Biology Essay / Theory
Topics: human respiration respiratory anatomy ventilation gas exchange
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay
Neco Model Questions Vol1 2025 Biology Question 4 diagram

The diagram shows a labelled cross‑section of the human respiratory system.

Question Parts

( a )
Identify and label the following structures in the diagram: (i) the passage that conducts air from the external environment to the lungs; (ii) the site where external respiration (gas exchange) occurs; (iii) the muscle that is the primary driver of inspiration.
( b )
Explain, in a concise paragraph, the pathway of air from the external environment to the alveoli, indicating the functional role of each structure named in part (a).
( c )
Given the following data for a resting adult: - Tidal volume (V_T) = 500 mL per breath - Respiratory rate (f) = 12 breaths min⁻¹ - Anatomical dead‑space volume (V_D) = 150 mL per breath Calculate: (i) the minute ventilation (V̇_E) in litres per minute; (ii) the alveolar ventilation (V̇_A) in litres per minute. Show all steps and state any formula used.
( d )
Discuss two physiological mechanisms that increase the rate of diffusion of gases across the alveolar membrane during moderate‑to‑intense exercise.

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About This Question

This is Neco Model Questions Vol1 2025 Biology Question 4. It is one of the essay questions from the 2025 Neco Model Questions Vol1 Biology examination.

The question covers human respiration, respiratory anatomy, ventilation, gas exchange .

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