part 3: homeostasis and cell transport (chapter 5)
DESCRIPTION
Which types of molecules can move through the membrane without energy? Small, nonpolar (hydrophobic) molecules Examples: O 2, CO 2, H 2 O, lipidsTRANSCRIPT
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Part 3: Homeostasis and Cell Transport (Chapter 5)
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Passive Transport
• NO ENERGY REQUIRED to move substances across membrane from a higher concentration to a lower concentration
• Types:1. Diffusion2. Osmosis3. Facilitated Diffusion4. Diffusion through Ion Channels
•Involves the movement of molecules across the cell membrane without an input of energy by the cell.
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Which types of molecules can move through the membrane
without energy?• Small, nonpolar (hydrophobic) molecules
• Examples: O2, CO2, H2O, lipids
![Page 4: Part 3: Homeostasis and Cell Transport (Chapter 5)](https://reader035.vdocument.in/reader035/viewer/2022062311/5a4d1b0e7f8b9ab05998d593/html5/thumbnails/4.jpg)
Diffusion
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Osmosis
Hypotonic Isotonic Hypertonic
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Facilitated Diffusion
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Ion Channels
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• Active transport • moves molecules across the cell
membrane from an area of lower concentration to an area of higher concentration (against concentration gradient)
• requires cells to use ENERGY (ATP)• Some types of active transport are
performed by carrier proteins called cell membrane pumps.
Active TransportCell Membrane Pumps and Vesicles
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Example: Sodium-Potassium Pump
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Sodium-Potassium Pump
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Endocytosis and
Exocytosis