Diffusion & Osmosis

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26 Terms

1

Diffusion

Movement of particles or molecules from an area of high concentration to an area of low concentration

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2

Osmosis

Diffusion of water across a selectively permeable membrane

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3

Selectively pemeable membrane

A membrane that allows certain materials to pass through, but not others

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4

Tonicity

A description of the relative solute concentration in a solution as compared to another solution.

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5

Equilibrium

The condition that exists in system when there is a relatively equal distribution of a particular molecule

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6

Hypertonic

A solution that has a higher concentration of solutes than another.

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7

Hypotonic

A solution that has a lower concentration of solutes than another.

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8

Isotonic

Two solutions that have an equal concentration of solutes.

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9

Solute

substance that is dissolved in a solution

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10

Solvent

the liquid that contains the dissolved solute in a solution.

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11

Cell Membrane

regulates and controls what enters or leaves the cell

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12

Facilitated Diffusion

this form of diffusion is regulated by protein channels in the membrane and requires no energy input from the cell

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13

Active Transport

movement of molecules or ion into or out of the cell against its concentration gradient (from low to high) and requires an input of energy.

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14

Endocytosis

movement of substances into the cell by creating a new vacuole at the cell membrane. requires energy.

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15

Exocytosis

movement of substances out of a cell by merging a vacuole with the cell membrane. requires energy.

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16

Hypertonic

the left side is _____ compared to the right side.

<p>the left side is _____ compared to the right side.</p>
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17

Hypotonic

The right side is _____ compared to the left side.

<p>The right side is _____ compared to the left side.</p>
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18

right, left, osmosis

Water will move from the _____ to the _____ by _____.

<p>Water will move from the _____ to the _____ by _____.</p>
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19

Hypotonic

The left side is _____ compared to the right side.

<p>The left side is _____ compared to the right side.</p>
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20

Hypertonic

The right side is _____ compared to the left side.

<p>The right side is _____ compared to the left side.</p>
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21

left, right, osmosis

Water will move from the _____ to the _____ by _____.

<p>Water will move from the _____ to the _____ by _____.</p>
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22

Cell Membrane

Composed of a phospholipid bilayer

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23

Phospholipid

molecule that makes up cell membranes. It has a hydrophilic "head" and two hydrophobic "tails".

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24

Hydrophilic

water loving. substances that easily mix with water.

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25

Hydrophobic

water hating. substances that will not mix with water.

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26

Transport Protein

Proteins within the cell membrane that function to move substances into or out of the cell.

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