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760.0. Figure 22.4.1 – Partial and Total Pressures of a Gas: Partial pressure is the force exerted by a gas. The sum of the partial pressures of all the gases in a mixture equals the total pressure. Partial pressure is extremely important in predicting the movement of gases.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
13.4 Summary. Gas exchange is the biological process through which gases are transferred across cell membranes to either enter or leave the blood. Gas exchange takes place continuously between the blood and cells throughout the body, and also between the blood and the air inside the lungs.
- Christine Miller
- 2020
Gas exchange is the process by which oxygen and carbon dioxide move between the bloodstream and the lungs. This is the primary function of the respiratory system and is essential for ensuring a constant supply of oxygen to tissues. This article will discuss the principles of gas exchange, factors affecting the rate of exchange, and relevant ...
Feb 24, 2023 · Figure 22.5.1 22.5. 1: Partial and Total Pressures of a Gas Partial pressure is the force exerted by a gas. The sum of the partial pressures of all the gases in a mixture equals the total pressure. Partial pressure is extremely important in predicting the movement of gases.
- Diffusion of Gases Through Gases
- Diffusion of Gases Through Liquids
- Fick’s Law
When gases are diffusing through other gases (such as in the alveoli), their rate of diffusion can be defined by Graham’s Law: “The rate of diffusion is inversely proportionalto the square root of its molar mass at identical pressure and temperature” In other words, the smaller the mass of a gas, the more rapidlyit will diffuse.
When gases are diffusing through liquids, for example across the alveolar membrane and into capillary blood, the solubility of the gases is important. The more soluble a gas is, the fasterit will diffuse. The solubility of a gas is defined by Henry’s law, which states that: “The amount of dissolved gas in a liquid is proportional to its partial pre...
Fick’s law gives us a number of factors that affect the rate of diffusion of a gas through fluid: 1. The partial pressure difference across the diffusion barrier 2. The solubility of the gas 3. The cross-sectional area of the fluid 4. The distance molecules need to diffuse 5. The molecular weight of the gas 6. The temperature of the fluid – not imp...
Gas Exchange. Gas exchange occurs at two sites in the body: in the lungs, where oxygen is picked up and carbon dioxide is released at the respiratory membrane, and at the tissues, where oxygen is released and carbon dioxide is picked up. External respiration is the exchange of gases with the external environment and occurs in the alveoli of the ...
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The gas exchange system affects oxygen, nitrogen and carbon dioxide from the air. Find out more with BBC Bitesize in this article for 11-14 year old students.
