CELL CELL TRANSPORTTRANSPORT

What is it?What is it?

Definition:Definition:

Cell Transport is Cell Transport is moving materials moving materials intointo, , out ofout of, or , or withinwithin the cellthe cell

Cell Transport Cell Transport withinwithin the cell the cell (intracellular) is (intracellular) is accomplished by-accomplished by- The The endoplasmic endoplasmic

reticulumreticulum and and Cytoplasmic Cytoplasmic

streamingstreaming

Cell transport Cell transport betweenbetween cellscells

Is accomplished through the Is accomplished through the cell cell (plasma) membrane(plasma) membrane

What is the purpose of cell What is the purpose of cell transport?transport?

Cells need to Cells need to bring in bring in materialsmaterials necessary necessary for homeostasisfor homeostasis

Cells need to Cells need to get rid get rid of wastesof wastes

Cells Cells produce produce materialsmaterials that will be that will be used in other parts of used in other parts of the cell, or outside the cell, or outside the cell in other parts the cell in other parts of the organismof the organism

Let’s review the structure-Let’s review the structure-

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The jobs of the plasma The jobs of the plasma membrane are:membrane are:

To decide what To decide what goes into and out ofgoes into and out of the cell,the cell,

CommunicationCommunication between cells between cells Carrying markers to Carrying markers to identify the cellidentify the cell

WaterWater

Passes freelyPasses freely through the cell through the cell membranemembrane

This process is called This process is called osmosisosmosis The water content is determined by The water content is determined by

the concentration of water the concentration of water inside inside and outsideand outside the cell the cell

Water will move from where there is Water will move from where there is moremore of it to where there is of it to where there is lessless of it of ithttp://web.educastur.princast.es/proyectos/biogeo_ov/2BCH/B2_CELULA/t22_MEMBRANA/gifs/osmosis.gif

Passive TransportPassive Transport

Also called Also called diffusiondiffusion - is - is accomplished through the accomplished through the membrane proteinsmembrane proteins

The cell does The cell does notnot have to use any of have to use any of its own energy for this to happenits own energy for this to happen

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Active transportActive transport

Also uses membrane proteins, but Also uses membrane proteins, but the cell is required to the cell is required to use energyuse energy for for this to happenthis to happen

Works Works againstagainst the concentration the concentration gradientgradient

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Active TransportActive Transport

Special types are Special types are endocytosisendocytosis-when -when the cell engulfs molecules within a the cell engulfs molecules within a vacuole vacuole

and and exocytosisexocytosis-when the cell expels -when the cell expels molecules from a vacuolemolecules from a vacuole

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The other proteins in the The other proteins in the membranemembrane

Are receptor molecules for Are receptor molecules for communicationcommunication between cells between cells

And marker proteins that And marker proteins that identifyidentify the cellthe cell

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