Neco 2019 Biology Question 38

Practice objective / multiple choice question 38 from the 2019 Neco Biology examination.

Neco 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 38 NECO • 2019 • BIOLOGY • objective
Neco 2019 Biology Question 38 diagram

The diagram of the human respiratory system is labelled with the following structures: NC (nasal cavity), PH (pharynx), LA (larynx), TR (trachea), BR (bronchi), BO (bronchioles), AL (alveoli). (a) Identify the structure where external respiration (gas exchange with the blood) occurs. (b) Each alveolus has an average surface area of 0.07 mm² and the adult lung contains about 4.8×10⁸ alveoli. Estimate the total alveolar surface area in square metres. (c) How many alveoli would be required to provide a total surface area of 70 m², assuming each alveolus still contributes 0.07 mm²?

Answer Options

A. Alveoli; total surface area ≈ 40.0 m²; 1.2×10⁹ alveoli needed for 70 m²
B. Bronchi; total surface area ≈ 28.8 m²; 8.0×10⁸ alveoli needed for 70 m²
Correct Answer C. Alveoli; total surface area ≈ 33.6 m²; 1.0×10⁹ alveoli needed for 70 m²
D. Alveoli; total surface area ≈ 33.6 m²; 5.0×10⁸ alveoli needed for 70 m²
Correct Answer
C
Correct Option:
Alveoli; total surface area ≈ 33.6 m²; 1.0×10⁹ alveoli needed for 70 m²

About This Question

This is Neco 2019 Biology Question 38. It is one of the objective questions from the 2019 Neco Biology examination.

Difficulty level: Medium .

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