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Cells and Their Environment
Biology with Mr. D.
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I. Cell membrane Semi-permeable function
Lets only certain molecules through.
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A. Passive Transport Substances move across membrane without using energy 1. Diffusion is an example Molecules move from an area of high concentration to a lower concentration. (down a concentration gradient)
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2. Osmosis Type of passive transport where water moves across a semi-permeable membrane
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3. Facilitated diffusion
When molecules move across the cell membrane with the help of proteins.
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B. Active Transport Uses energy to transport molecules across the cell membrane. (ATP) Ex. Sodium-potassium pump
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II. Solution Concentrations
A. Hypertonic Solution with a higher concentration of solutes B. Hypotonic - Solution with a lower concentration of solutes C. Isotonic -Concentration is the same on both sides
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III. Bulk Movement
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A. Exocytosis Wastes are secreted out of the cell
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B. Endocytosis Cell membrane surrounds a molecule and engulfs it.
1. Phagocytosis- takes in solid material 2. Pinocytosis- takes in liquid material
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