1. Cells and Cellular Transport
S7L2a
Explain that cells take in nutrients in order to grow and divide and to make needed materials

2. Characteristics of ALL Living Things
Cells
Sensitivity to stimuli
Growth
Homeostasis (stable internal environment)
Reproduction
Metabolism (transformation and use of energy)
Adaptation

3. Cell Theory
The Cell is the basic structural and functional unit of all organisms.
Cell Theory states three things:
All living things are made of cells
All cells come from other living cells of the same kind
Cells are the basic unit of all living things

4. Transport of Cell Material
Passive transport –Molecules move through plasma membrane from areas of higher concentration to areas of lower concentration
Spontaneous
No energy required
Two types
Diffusion
Osmosis

5. Process by which substances move from areas of higher concentration to areas of lower concentration

6. Movement of water through a semi-permeable membrane from an area of high water concentration to an area of low water concentration
Semi-permeable means it prevents some molecules from crossing. Think of osmosis as the diffusion of water when only water can get through the semi-permeable membrane

7. Solution Type
Effect on cell
Isotonic
Particle concentration the same outside and inside cell
Same amount of water in cell as water out of cell
Hypotonic
Particle concentration lower in solution than in cell
Water in cell and the cell swells
Hypertonic
Particle concentration higher in solution than in cell
Water out of cell and cell shrinks

8. Active Transport Not spontaneous
Cell must use stored energy to move substances across the cell membrane in the opposite direction of concentration
Example
Using active transport, a cell will move dissolved substances from an area of lower concentration to an area of higher concentration
Opposite of diffusion, therefore requires energy

9. Exocytosis
Type of active transport in which materials are discharged out of a cell
Opposite is endocytosis, which is a type of active transport in which substances are imported INTO the cell.