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In diffusion, substances flow with a concentration gradient, meaning that they flow from areas of high concentration to areas of lower concentration. Flowing against a concentration gradient would be going from an area of low concentration to an area of higher concentration, but this only occurs in active transport.

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Q: How is the concentration gradient of a substance important to diffusion?
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Movement of a substance down the substance's concentration gradient?

diffusion


Where and when does diffusion occur?

Diffusion occurs when there is a concentration gradient i.e. a substance moves from higher to lower concentration.


What does it means if a substance moves down its concentration gradient?

If a substance moves down its concentration gradient, it means that it is moving from an area where it has a high concentration to an area where it has a low concentration. This is known as diffusion.


What is meant by the term gradient?

Difference in concentration of a substance at 2 areas is called gradient , and it allows diffusion .


Why is diffusion affected by a decrease in concentrated gradient?

Diffusion is affected by a decrease in concentration gradient because concentration gradient is directly proportional to the rate of diffusion. A decrease in concentration gradient also lowers the rate of diffusion.


What is the pressure for diffusion that is produced by the concentration gradient?

Osmotic Pressure. It exists anywhere that there is a soluble substance concentration gradient; that is, not only when a membrane separates substance concentrations. See: Brownian Motion.


If diffusion is going to occur there has to be what?

A difference in the concentration throughout space because diffusion doesn't just happen in a cell or aqueous solution by definition diffusion is just from high to low concentration


When water moves through an area of higher concentration to lower concentration?

When a region of higher concentration to a region of Lower concentration against the gradient which requires Energy is called Active Transport


How does the Concentration gradient of a substance affect the movement of that substance and the expenditure of energy?

The larger the concentration gradient (bigger difference between the two solutes across semipermeable membrane) the faster the rate of diffusion.


Is diffusion an active mechanism?

False


Why does simple diffusion end?

Diffusion is complete when there ceases to be a concentration gradient. For example diffusion has ended if the concentration of a substance is equal on the inside and outside of a permeable membrane, this state is also referred to as dynamic equilibrium.


Is the movement of a substance to an area of low concentration from an area of high concentration?

passive transport Movement down a concentration gradient is known as diffusion.