Neco 2023 Biology Question 7

Practice objective / multiple choice question 7 from the 2023 Neco Biology examination.

Neco 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 7 NECO • 2023 • BIOLOGY • objective

In a labelled diagram of the human respiratory system, the structure marked as 4 is the alveolar region. Each alveolus can be approximated as a sphere of radius \(0.1\,\text{mm}\). Only 70% of the alveoli are functional, and the total number of alveoli is \(3\times10^{8}\). Determine which labelled structure is primarily responsible for gas exchange and calculate the total surface area available for diffusion (in \(\text{m}^{2}\)), using the formula for the surface area of a sphere.

Answer Options

A. Respiratory membrane (label 2); total surface area ≈ 22.0 m²
Correct Answer B. Alveolar region (label 4); total surface area ≈ 26.4 m²
C. Bronchioles (label 3); total surface area ≈ 15.2 m²
D. Alveolar sac (label 5); total surface area ≈ 30.1 m²
Correct Answer
B
Correct Option:
Alveolar region (label 4); total surface area ≈ 26.4 m²

About This Question

This is Neco 2023 Biology Question 7. It is one of the objective questions from the 2023 Neco Biology examination.

Difficulty level: Hard .

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