Cells and Their Environment

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Presentation transcript:

Cells and Their Environment Biology with Mr. D.

I. Cell membrane Semi-permeable function Lets only certain molecules through.

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)

2. Osmosis Type of passive transport where water moves across a semi-permeable membrane

3. Facilitated diffusion When molecules move across the cell membrane with the help of proteins.

B. Active Transport Uses energy to transport molecules across the cell membrane. (ATP) Ex. Sodium-potassium pump

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

III. Bulk Movement

A. Exocytosis Wastes are secreted out of the cell

B. Endocytosis Cell membrane surrounds a molecule and engulfs it. 1. Phagocytosis- takes in solid material 2. Pinocytosis- takes in liquid material