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Diffusion is the spontaneous spreading of something such as particles, heat, or momentum. The phenomenon is readily observed when a drop of colored water is added to clear water, or when smoke from a chimney dissipates into the air.

Diffusion, Osmosis, and Movement Across a Membrane
Spontaneous movement of particles from an area of high concentration to an area of low concentration
Does not require energy (exergonic)
Occurs via random kinetic movement ...

passage of molecules of one substance among those of another, from a region of greater concentration to one of lower concentration
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...

From Wikipedia, the free encyclopedia
(Redirected from Concentration gradient) ...

Diffusion and Semi-Permeable Membranes
Day 1: Weigh a raw egg and place in 200ml of vinegar. Cover and leave over night. (The shell will disintegrate leaving the membrane visible).

Unlike active transport, diffusion does not involve chemical energy. When molecules move (diffuse) via special transport proteins found within the cell membrane, it is called facilitated diffusion, otherwise it is only simple diffusion.

Diffusion occurs in solutions consisting of particles
Air and drinking water are both examples of solutions consisting of mixtures of different types of particles.

Applied to the movement of molecules in liquids or gazes.
View Dr Chromo's lecture on blood cells
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Cell diffusion is a type of passive cell transport. In diffusion, molecules move from areas of high concentration to areas of low concentration in order to decrease the concentration gradient.

Substances move down their conc. gradient until the conc. are in equilibrium
Microvilli are extensions of the plasma membrane
They increase the surface area of the membrane, therefore
They accelerate the rate of diffusion ...

This is the process that is used in oxygen entering a cell, and carbon dioxide leaving.

Diffusion is defined as the movement of molecules from an area of high concentration to an area of low concentration
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Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The movement is due to collisions among the particles.

Diffusion: A group of particles, initially confined to a small volume will, over time, disperse. This movement is produced by collisions with neighboring molecules, which are in constant motion.

diffusion The spontaneous movement of particles from an area of higher concentration to an area of lower concentration. PICTURE ...

[L. diffundere, to pour out]
The spontaneous tendency of a substance to move down its concentration gradient from a more concentrated to a less concentrated area.
digestion ...

diffusion /də-FYOO-shən, diff-/ n. The tendency of a substance to move in the direction toward which it is less concentrated.
digestion n. The process by which food is broken down into a form that can be absorbed by the body.

diffusion the movement of molecules through a membrane from a region of high concentration to low concentration.
diploid cells having two sets of chromosomes.
diploid nuclei contained within a mass of cytoplasm within cellular slime molds.

Diffusion: The net movement of units of a substance from areas of higher concentration to areas of lower concentration of that substance.
Digestion efficiency: The fraction of living food that does not survive passage through a predator's gut.

diffusionNet movement of a molecule across a membrane down its concentration gradient at a rate proportional to the gradient and the permeability of the membrane.
patch clamping ...

Blood carries oxygen, carbon dioxide, and hydrogen ions between tissues and the lungs. The majority of CO2 transported in the blood is dissolved in plasma (primarily as dissolved bicarbonate; 60%).

Diffusion - The transport process in which molecules naturally travel from an area of higher concentration to an area of lower concentration.

Diffusion is the net movement of a substance (liquid or gas) from an area of higher concentration to one of lower concentration. You are on a large (10 ft x 10 ft x10 ft) elevator.

diffusion of a signaling molecule out of one cell and into other cells in the vicinity; ...

Diffusion alone is not adequate for transporting substances over long distances in animals-for example, for moving glucose from the digestive tract and oxygen from the lungs to the brain of a mammal.

Diffusion is the passive movement of particles from a region of high concentration to a region of low concentration.

diffusion The random movement of molecules from one location to another because of random thermal molecular motion; net diffusion always occurs from a region of higher concentration to a region of lower concentration.

Diffusion the net movement of molecules or ions from a region of high concentration to a region of low concentration.
Digestion the breakdown of food material into simple molecules that can be absorbed by the body.

Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.

Agar gel diffusion
a laboratory procedure which detects precipitins, a type of antibodies, when serum diffuses in agar and combines with a soluble antigen ...

An image processing method for reduction of shot noise without degradation of an image.
AOTF ...

Flatworms get most of their oxygen through diffusion. Since they have no specialized circulatory system, their flatness gives them a greater surface area to absorb more oxygen.

Haykin ME, Gorman M, van Hoff J, Fulbright RK, Baehring JM: Diffusion-weighted MRI correlates of subacute methotrexate-related neurotoxicity. ...

Robert Brny for research on the vestibular apparatus of the inner ear 1919 Jules Bordet for discovery of the complement in the immune system 1920 Schack August Steenberg Krogh for showing that the gas exchange in the lungs is ordinary diffusion ...

Studies of whole cell dynamics currently employ optical imaging of diffusion, generally through the use of steady state or dynamic photobleaching recovery methods.

For the reception and diffusion of the weight each acetabular cavity is strengthened by two additional bars running toward the pubis and ischium.

Transport may occur by diffusion and osmosis across the membrane. It can also occur when a vescicle attaches to the cell membrane from the inside and then opens to form a pocket, expelling its contents to the outside. This may be called exocytosis.

So this convoluted geometry can have flow through it, but for the interior cell clusters, the access of a nutrient is still controlled by diffusion.

In thin, simple aquatic organisms that are sedentary, gas exchange is simply by diffusion through the "skin" or outer surface of the body. This type of gas exchange is typical of the sponges, Cnidaria, and flatworms.

Cell Biology - Membranes: concentration gradient, diffusion, hypertonic, hypotonic, isotonic, neurotransmitter, osmosis, passive transport, receptor, receptor protein, active site, resting potential, sodium-potassium pump, target cell, ...

passive transport (facilitated diffusion) - movement of a molecule across a membrane down its concentration gradient
peripheral membrane proteins-proteins that can be released from the membrane ...

Life is a delay of the spontaneous diffusion or dispersion of the internal energy of the biomolecules towards more potential microstates.

10 Steps of Glycolysis
Cellular Respiration
Diffusion, Passive Transport, and Osmosis
DNA Transcription
Programmed Cell Death ...

See also: See also: Trans, Biology, Cells, Cell, Organ

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