Gce Model Questions Vol1 2018 Biology Question 32

Practice objective / multiple choice question 32 from the 2018 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 32 GCE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective
Gce Model Questions Vol1 2018 Biology Question 32 diagram

In the labelled diagram of the human respiratory system, the structure marked with label D is the primary site of gas exchange. Identify label D and explain the partial‑pressure gradient that drives oxygen from the air to the blood.

Answer Options

A. Label D is the alveolar sac (alveoli); O₂ moves from alveolar air (≈80 mmHg) to blood (≈40 mmHg) because of this higher partial‑pressure gradient.
B. Label D is the alveolar sac (alveoli); O₂ moves from alveolar air (≈100 mmHg) to blood (≈60 mmHg) because of this higher partial‑pressure gradient.
Correct Answer C. Label D is the alveolar sac (alveoli); O₂ moves from alveolar air (≈100 mmHg) to blood (≈40 mmHg) because of this higher partial‑pressure gradient.
D. Label D is the bronchiole; O₂ moves from alveolar air (≈100 mmHg) to blood (≈40 mmHg) because of this higher partial‑pressure gradient.
Correct Answer
C
Correct Option:
Label D is the alveolar sac (alveoli); O₂ moves from alveolar air (≈100 mmHg) to blood (≈40 mmHg) because of this higher partial‑pressure gradient.

About This Question

This is Gce Model Questions Vol1 2018 Biology Question 32. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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