Which of the following factors does not influence the exchange of gases across the respiratory membrane? mcq given below:
Q. Which of the following factors does not influence the exchange of gases across the respiratory membrane?(a)The thickness of the membrane
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🫁 Gas Exchange Across the Respiratory Membrane
✅ Answer: (c) The size of the pores in the alveoli
📖 What is a Respiratory Membrane?
Respiratory = Related to breathing 🫁
Membrane = Thin layer or barrier
👉 The respiratory membrane is the thin barrier between the air in the alveoli and the blood in pulmonary capillaries where oxygen and carbon dioxide are exchanged.
🫧 What are Alveoli?
Alveoli are tiny air sacs present in the lungs.
👉 They are the main site where oxygen enters the blood and carbon dioxide leaves the blood.
⚙️ What Factors Affect Gas Exchange?
Gas exchange depends mainly on:
- Thickness of the membrane → Thicker membrane = Slower diffusion
- Surface area of the membrane → Larger area = More gas exchange
- Concentration gradient → Greater difference = Faster diffusion
❌ Why is Option (c) Correct?
The alveoli do not exchange gases through “pores.”
👉 Oxygen and carbon dioxide diffuse directly across the thin respiratory membrane.
Therefore, the size of alveolar pores does not significantly influence gas exchange.
❌ Why Other Options Are Wrong?
(a) Thickness of membrane
Affects diffusion directly. Thicker membrane slows gas exchange.
(b) Total surface area
More surface area allows more oxygen and carbon dioxide to diffuse.
(d) Concentration gradient
Gas moves from higher concentration to lower concentration, making this a major factor.
Gas exchange depends on Thickness + Surface Area + Concentration Gradient.
Alveolar pore size is not a standard factor.
📌 Disclaimer: For nursing exam preparation only. Follow standard physiology textbooks for detailed concepts.
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