In the present context the diffusion of O 2 from alveoli to pulmonary capillaries and of CO 2 in the reverse direction is to be considered. Diffusion happens in liquids and gases because their particles move randomly from place to place. Synonym (s): passive transport. Please refer to the appropriate style manual or other sources if you have any questions. (dif-ū′zhŏn) [L. diffusio, pouring out, spreading out] DIFFUSION OF RESPIRATORY GASES. Farlex Partner Medical Dictionary © Farlex 2012. In the body, oxygen and carbon dioxide move by diffusion. Kids Definition of diffusion. History of diffusion. This movement occurs until particles are evenly spread out. Diffusion is a result of the kinetic properties of particles of matter. Diffusion coefficient definition: the rate at which a diffusing substance is transported between opposite faces of a unit... | Meaning, pronunciation, translations and examples Diffusion is an important part of many biological and chemical processes. Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) from a region of higher concentration to a region of lower concentration. Simple diffusion does not require energy and occurs along the concentration gradient. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. They have evolved to have internal structures and systems for rapid distribution movement. Diffusion is an important process for living things; it is how substances move in and … Information and translations of diffusion in the most comprehensive dictionary definitions resource on … ion diffusion across a … diffusion. When a permeable membrane (a membrane that allows molecules to cross it) divides a heavily concentrated solution from a less-concentrated solution, there…. Our editors will review what you’ve submitted and determine whether to revise the article. ses (-sēz) 1. a. Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal solute concentration on both sides of the membrane. Diffusion is driven by a gradient in concentration. Molecules tend to move from places of high concentration to places of low concentration, just by moving randomly. A familiar example is the perfume of a flower that quickly permeates the still air of a room. In small unicellular organisms, simple diffusion can exchange molecules quickly enough to keep them alive. Atoms and small molecules can move across a cell membrane by diffusion. It tends to equalize the solute concentration on either side of the membrane. Updates? diffusion definition: 1. the action of spreading in many directions: 2. Diffusion is a passive process, therefore does not require energy as it occurs down a concentration gradient. It describes the constant movement of particles in all liquids, gases and … b. Lesson Summary. Find 11 ways to say DIFFUSION, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. Austin Community College District - Biology Course Redesign Project - What is diffusion? Diffusion was discovered just over 100 years ago by Sir Roberts-Austen. (of a gas or liquid) the process of spreading…. Passive transport is the diffusion of substances across a membrane. D is called the diffusivity and governs the rate of diffusion. The random movement of fluid molecules makes them spread out until a boundary stops them. According to Biology Online The definition of Diffusion is "The passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration." Simple diffusion occurs when small, nonpolar molecules transport through the selectively permeable cell membrane. Cambridge Dictionary +Plus. Key Difference – Osmosis vs Diffusion in Biology. the protein-mediated transport of a compound across a biomembrane that is not ion-driven; a saturable transport system. A dissolved molecule or a small particle suspended in a fluid is constantly struck at random by molecules of the fluid in its neighbourhood,... A dissolved molecule or a small particle suspended in a fluid is constantly struck at random by molecules of the fluid in its neighbourhood, as a result of which it wanders erratically. Diffusion is the net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of … What does diffusion mean? For example, humans have lungs to make diffusion happen rapidly. (A) A high concentration of KCl is placed on side 1, opposite a semipermeable membrane from a low concentration. Diffusion in biology applies the exact same principle but the practice involves a biological system, including a semipermeable membrane. Meaning of diffusion. Ring in the new year with a Britannica Membership, This article was most recently revised and updated by, https://www.britannica.com/science/diffusion. (of a gas or liquid) the process of spreading…. In science, diffusion is the process of the interpenetration of microparticles upon the contact of different materials. Diffusion usually happens in a solution in gas, a liquid and occasionally colloids. It is possible to see diffusion happening when two liquids are mixed in a transparent container. Some major examples of diffusion in biology: Let us know if you have suggestions to improve this article (requires login). It describes the constant movement of particles in all liquids, gases and colloids. gradient - a graded change in the magnitude of some physical quantity or dimension. For example, there is more oxygen in a lung than there is oxygen in the blood so oxygen molecules will tend to move into the blood. It happens in cell biology, where small molecules simply diffuse through the cell membrane, but larger molecules only get through by using energy: see active transport. The result of diffusion is a gradual mixing... Full article >>>. Learn more. The tendency of the molecules of a substance (gas, liquid, or solid) to move from a region of high concentration to one of lower concentration. Diffusion Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. ‘But diffusion of ideas does not mean they are implemented; it only means they are talked about.’. In biology, a gradient results from an unequal distribution of ions across the cell membrane. Heat conduction in fluids involves thermal energy transported, or diffused, from higher to lower temperature. Osmosis is the process of spontaneous net movement of solvent molecules (water molecules) through a semi-permeable membrane to a region of higher solute concentration. In diffusion, molecules move from areas of high concentration to areas of low concentration in order to decrease the concentration gradient. Diffusion is the movement of a fluid from an area of higher concentration to an area of lower concentration. The same happens in plants with the leaf. Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration. It continues until the concentration of substances is uniform throughout. Corrections? Start studying Biology - Diffusion. There are three main types of diffusion, which include simple diffusion, channel diffusion and facilitated diffusion. The tendency of fluids to diffuse in such a manner. Diffusion is a type of transport that moves molecules or compounds in or out of a cell. Diffusion is the tendency of molecules to spread out in order to occupy an available space. (ii) It is a means of spreading of ions and other substances throughout the protoplast. Diffusion is the movement of a solute in a solvent, which is controlled by a … Learn vocabulary, terms, and more with flashcards, games, and other study tools. However, for multicellular organism simple diffusion is not enough. 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. Leipzig University - Diffusion Fundamentals - Heroes and Highlights in the History of Diffusion, Institute of Microelectronics - The Physics of Diffusion, Science Education Resource Center - On the Cutting Edge - Diffusion and Partitioning, ion diffusion across a semipermeable membrane. defined as the process wherein the molecules merge as a result of their kinetic energy of random motion
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