cell transport pp. 103-106. passive transport: movement across the cell membrane without energy
DESCRIPTION
Diffusion: movement of molecules from area of high concentration (CONC) to area of low concentrationTRANSCRIPT
![Page 1: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/1.jpg)
CELL TRANSPORTpp. 103-106
![Page 2: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/2.jpg)
Passive transport:•Movement across the cell membrane without energy
![Page 3: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/3.jpg)
Diffusion: movement of molecules from area of high concentration
(CONC) to area of low concentration
![Page 4: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/4.jpg)
• Molecules have kinetic energy• Concentration gradient: difference
between high and low concentration• Molecules move “down” gradient.• Molecules move until they reach
equilibrium (when all molecules are evenly spread out).
![Page 5: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/5.jpg)
What characteristic does the cell membrane have?•Cell membrane is nonpolar and tightly packed•Small and nonpolar substances can easily pass through the cell membrane
![Page 6: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/6.jpg)
Active Transport
• Requires energy• Molecules move from an area of
low concentration to an area of high concentration
• Move against the concentration gradient
![Page 7: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/7.jpg)
Membrane pumps
![Page 8: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/8.jpg)
• Carrier proteins that are active are called pumps.
• Protein binds to a specific molecule.• Protein transfers the molecule to the other
side.• Sodium-Potassium Pump: transports Na+
and K+ against (not down) gradient
Na+ out and K+ in
![Page 9: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/9.jpg)
![Page 10: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/10.jpg)
Endocytosis: ingest large molecules to move molecules into cell
• Membrane makes a pouch.• Pouch then pinches off and makes a vesicle.• Vesicle binds with lysosome to digest
substance.
![Page 11: CELL TRANSPORT pp. 103-106. Passive transport: Movement across the cell membrane without energy](https://reader035.vdocuments.mx/reader035/viewer/2022081514/5a4d1b0e7f8b9ab05998d5a0/html5/thumbnails/11.jpg)
Exocytosis: (the reverse of endocytosis) moving large particles
out of the cell