   Chapter 4, Problem 10RQ

Chapter
Section
Textbook Problem

According to Fick’s law, gas diffusion is1. Directly proportional to the thickness of the tissue2. Indirectly proportional to the diffusion constants3. Directly proportional to the difference in partial pressure of the gas between the two sides4. Indirectly proportional to the tissue areaA. 1 onlyB. 3 onlyC. 4 onlyD. 2 and 3 only

Summary Introduction

Introduction:

The process of gas diffusion can be explained as the movement of gas molecules towards a low concentration zone from the area of its high concentration. The process of diffusion of gases in the human body is seen in the alveolar-capillary system. In this system, the oxygen moves from the alveolar space (high concentration) to a low concentration zone (capillaries) and carbon dioxide moves from a high concentration zone (capillaries) to a low concentration zone (alveolar space). There is a diffusion gradient which is established because of the difference between the partial pressure of the individual gases.

Explanation

Explanation for the correct answer:

Option (B) is, ‘3 only’. Fick’s law states that the rate of diffusion of a gas transferring across a tissue sheet is inversely proportional to the thickness of the sheet of the tissue and directly proportional to the surface area of the tissue, the difference in partial pressure of gas on the 2 sides of the tissue, and to the diffusion constants. Hence, option (B) is correct.

Explanation for the incorrect answers:

Option (A) is ‘1 only’. Statement 1 is given that gas diffusion is directly proportional to the thickness of the tissue. According to Fick’s law, the rate of diffusion is inversely proportional to the thickness of the tissue sheet...

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