Cell transport 2011a
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The cell membrane functions as a selectively permeable barrier that allows some substances to pass through via diffusion, facilitated diffusion, or active transport processes. Diffusion allows for the passive movement of small molecules and ions according to their concentration gradients. Larger molecules and ions require membrane transport proteins like channel and carrier proteins to cross. The cell takes in nutrients and disposes of waste through endocytosis and exocytosis, respectively. Active transport requires energy to pump molecules against their gradients via proteins like the sodium-potassium pump.
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Cell transport 2011a
- 1. Cell (Plasma)Membrane All cells acquire the molecules and ions they need from their surrounding extracellular fluid. There is constant traffic of substances moving across the membrane.
- 2. Moving Substances Across the Cell Membrane The cell membrane functions as a semi-permeable or selectively- permeable barrier. This means it allows very few molecules across it while keeping the majority of organically produced chemicals inside the cell.
- 4. Diffusion
- 5. Molecule Movement of Diffusion
- 11. K+ Ion Channels
- 12. Facilitated Diffusion of Glucose
- 17. Red Blood Cells in Hypotonic Solution http://www.biosci.ohiou.edu/introbioslab/Bios170/170_3/09009jwa.jpg
- 18. Red Blood Cells in Hypertonic Solution www.biosci.ohiou.edu/.../ 170_3/09014jwa.jpg
- 20. Red Blood Cells in Solution
- 21. Plant Cells in Solution Turgid Elodea Plasmolyzed Elodea
- 22. Active Transport Movement of molecules across the cell membrane that requires energy. Source of energy: ATP
- 25. Exocytosis
Editor's Notes
- #21: Hemolysis: release of hemoglobin into fluid after lysing of RBCs Crenation: formation of abnormal indentation into cell membrane