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- Diffusion Definition
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Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. The material that diffuses could be a solid, liquid or gas. Similarly, the medium in which diffusion occurs could also be in one of the three physical states. One of the main characteristics of diffusion is...
Diffusion is an important part of many biological and chemical processes. In biological systems, diffusion occurs at every moment, across membranes in every cell as well as through the body. For example, oxygen is at a higher concentration inside arteries and arterioles, when compared with the oxygen levels in actively respiring cells. By the time ...
Diffusion is affected by temperature, area of interaction, steepness of the concentration gradient and particle size. Each of these factors, independently and collectively can alter the rate and extent of diffusion.
Diffusion in the human body is necessary for the absorption of digested nutrients, gas exchange, the propagation of nerve impulses, the movement of hormones and other metabolites towards their target organ and for nearly every event in embryonic development.
Concentration Gradient– Gradual decrease in the concentration of a substance, often a solute in a solution. Within living systems, this gradient is usually seen on two sides of a semi-permeable lip...Hepatocytes– Cells in the inner parenchymal region of the liver, making up a large proportion of liver mass. Involved in the digestion and metabolism of proteins, lipids and carbohydrates. They als...Integral Membrane Protein– Proteins that span the width of a membrane and are important structural and functional parts of biological membranes.Sublimation– The conversion of a material in its solid phase directly into the gaseous state, without an intervening transition into the liquid state.1. Which of these statements about diffusion of molecules is true? A. Facilitated diffusion is powered entirely by GTP hydrolysis B. Never needs the presence of any other molecule C. Diffusion of every molecule is dependent on its concentration gradient and independent of the concentration of other molecular species in the medium D.All of the above...
Mehrer, H. and Stolwijk, N. A. (2005). “Heroes and Highlights in the History of Diffusion”. Diffusion Fundamentals2, 1.1–1.10.Philibert, J. (2009). “One and a Half Century of Diffusion: Fick, Einstein, before and beyond”. Diffusion Fundamentals11 (1):1-32.Spaeth, E. E., and Friedlander, S.K. (1967). ” The Diffusion of Oxygen, Carbon Dioxide, and Inert Gas in Flowing Blood”. Biophys J.7(6): 827–851.- Perfumes/Incense Sticks. When perfume (scents, incense sticks, room sprays, fragrance sprays) are sprayed at one part of the room, it spreads throughout the whole room due to diffusion.
- Helium Balloons. Helium balloons deflate slowly and lose their lift. This happens because helium diffuses from the helium-rich area (balloon) to low helium area (outside environment).
- Tea Bags. When we put tea bags into a cup of water, it automatically mixes in the whole cup of tea, and it happens due to diffusion. Tea bag contents diffuse from its higher concentration to lower concentration (water in the mug).
- Soda/Cold Drinks. After a few seconds of opening a soda bottle, soda goes flat. This is because the CO2 (Carbon dioxide) concentration is higher in the bottle than the outside environment and hence, CO2 diffuses from its higher concentration to its lower concentration.
diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room. Heat conduction in fluids involves thermal energy transported, or diffused, from ...
- The Editors of Encyclopaedia Britannica
Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient. 2. List the types of diffusion. Diffusion can be divided into two main types, namely, simple diffusion and facilitated diffusion. 3.
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- Simple diffusion is defined as the process in which a substance moves through a semipermeable membrane or in a solution without any help from trans...
- In a cell, water, oxygen and carbon dioxide molecules can pass directly through the cell membrane without requiring any energy along the concentrat...
- Facilitated diffusion can be defined as the passive movement of molecules across the cell membrane from a region of higher concentration to a regio...
- In the human body, glucose molecules, sodium and potassium ions use carrier proteins to pass through the cell membranes.
- Dialysis works through the diffusion of solutes across a selectively permeable membrane. A selectively permeable membrane is the one that allows on...
- Temperature, area of interaction, size of the particle and the steepness of the concentration gradient are all factors that affect the process of d...
- Diffusion is a very important process occurring in all living beings. All living organisms exhibit one or the other form of diffusion, allowing the...
Apr 4, 2022 · Examples of Diffusion. Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere. A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored. When steeping a cup of tea, molecules from the tea cross from the tea bag and diffuse throughout the ...
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Nov 21, 2023 · Diffusion is defined as the movement of atoms, ions, and molecules from a region of high concentration to a region of low concentration, or ‘down their concentration gradient ’. The word ‘diffusion’ is derived from the Latin word, ‘diffundere’, meaning ‘to spread out’. The random movement of ‘molecules existing in any state of ...
