Diffusion, Osmosis and Active Transport

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19 Terms

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Diffusion

The movement of molecules (matter) from an area of greater concentration (how much of something) to an area of lower concentration. Does not require energy.

<p>The movement of molecules (matter) from an area of greater concentration (how much of something) to an area of lower concentration. Does not require energy.</p>
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Osmosis

The movement of water across a semi-permeable membrane through diffusion. (semi-permeable means lets some things in and not others)

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Passive Transport

Does NOT require energy....the movement of molecules (matter) from an area of high concentration to an area of low concentration. Diffusion is a kind of passive transport.

<p>Does NOT require energy....the movement of molecules (matter) from an area of high concentration to an area of low concentration. Diffusion is a kind of passive transport.</p>
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Equilibrium

A system in which things become equal; all particles (molecules or matter) become equal

<p>A system in which things become equal; all particles (molecules or matter) become equal</p>
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Cell Membrane

Double layer of phospholipids. Holds everything in. Decides what can enter or leave the cell.

<p>Double layer of phospholipids. Holds everything in. Decides what can enter or leave the cell.</p>
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Selectively Permeable

Selective= pick and choose
Permeable= things can pass through
The cell membrane is said to be selectively permeable because it allows certain things to pass through and prevents other things from passing through.

<p>Selective= pick and choose<br>Permeable= things can pass through<br>The cell membrane is said to be selectively permeable because it allows certain things to pass through and prevents other things from passing through.</p>
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Active Transport

The movement of substances into/out of cell through the membrane, against the concentration gradient (from low to high). Requires ATP.

<p>The movement of substances into/out of cell through the membrane, against the concentration gradient (from low to high). Requires ATP.</p>
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Membrane proteins

Proteins that sit in the membrane and do the work of the membrane, such as Recognition, Receptors, and Transporters

<p>Proteins that sit in the membrane and do the work of the membrane, such as Recognition, Receptors, and Transporters</p>
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semi-permeable

A membrane that allows only certain things to pass through

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solute

Substance dissolved in a solution

<p>Substance dissolved in a solution</p>
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solvent

Substance in which something is dissolved - often WATER

<p>Substance in which something is dissolved - often WATER</p>
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Surface area

The amount of surface of the object that touches the outside world

<p>The amount of surface of the object that touches the outside world</p>
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receptor

Protein that detects a signal molecule and performs an action in response.

<p>Protein that detects a signal molecule and performs an action in response.</p>
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concentration gradient

Difference in concentration of a substance from one place to another.

<p>Difference in concentration of a substance from one place to another.</p>
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isotonic

Solution that has an equal concentration of solutes as another solution.

<p>Solution that has an equal concentration of solutes as another solution.</p>
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hypertonic

Solution that has a higher concentration of solutes as another solution.

<p>Solution that has a higher concentration of solutes as another solution.</p>
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hypotonic

Solution that has a lower concentration of solutes as another solution.

<p>Solution that has a lower concentration of solutes as another solution.</p>
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Starch

Storage form of glucose in plants
A complex carbohydrate found in potatoes, rice, corn, and many other vegetables

<p>Storage form of glucose in plants<br>A complex carbohydrate found in potatoes, rice, corn, and many other vegetables</p>
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Glucose

A simple sugar that is an important source of energy.

<p>A simple sugar that is an important source of energy.</p>