Cell Transport

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Last updated 5:23 PM on 6/3/26
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19 Terms

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Homeostasis

Stable internal environment

<p>Stable internal environment</p>
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phosphate heads are

polar, hydrophilic

<p>polar, hydrophilic</p>
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lipid tails are

nonpolar, hydrophobic

<p>nonpolar, hydrophobic</p>
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receptor proteins

help the cell sense its environment

<p>help the cell sense its environment</p>
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transport proteins

help move substances across the cell membrane

<p>help move substances across the cell membrane</p>
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Enzymes

help with chemical reactions inside the cell

<p>help with chemical reactions inside the cell</p>
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Protein Doorways

Large particles enter the cell through these

<p>Large particles enter the cell through these</p>
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concentration gradient

difference in the concentration of a substance from one location to another

<p>difference in the concentration of a substance from one location to another</p>
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concentration

the amount of substance in a certain area

<p>the amount of substance in a certain area</p>
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Equilibrium

molecules moving randomly to evenly fill a space

<p>molecules moving randomly to evenly fill a space</p>
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Diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration.

<p>Movement of molecules from an area of higher concentration to an area of lower concentration.</p>
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Osmosis

Diffusion of water through a selectively permeable membrane

<p>Diffusion of water through a selectively permeable membrane</p>
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passive transport

the movement of substances across a cell membrane without the use of energy (ATP) by the cell

<p>the movement of substances across a cell membrane without the use of energy (ATP) by the cell</p>
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active transport

the movement of materials through a cell membrane using energy (ATP)

<p>the movement of materials through a cell membrane using energy (ATP)</p>
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Diffusion is complete when particles reach

equilibrium

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Bi-layer

two layers

<p>two layers</p>
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cell membrane

thin, flexible barrier around a cell; regulates what enters and leaves the cell

<p>thin, flexible barrier around a cell; regulates what enters and leaves the cell</p>
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Semi-permeable

membranes that allow some substances through but not others

<p>membranes that allow some substances through but not others</p>
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Phospholipids

Cell membrane is made of these.

<p>Cell membrane is made of these.</p>