1. Cells Part 2

2. Exchanges Between the Cell & Its Environment
4 types :
Diffusion
Osmosis
Photosynthesis
Cellular Respiration

3. Words to Remember from the Video
Solute
Solvent
Diffusion
Equilibrium
Osmosis
Semi-permeable membrane
High/ Low concentration

4. Diffusion
Diffusion is the process by which molecules spread from areas of high concentration, to areas of low concentration.
When the molecules are even throughout a space - it is called EQUILIBRIUM

5. In other words…
Diffusion is the movement of SOLUTE from a HIGH concentration to a LOW concentration.
EQUILIBRIUM
HIGH
LOW

6. Osmosis
Osmosis is the passage of water across a membrane that only allows certain substances to pass

7. Osmosis cont.
The solute is more concentrated on the right side to start with. This causes molecules to move across the membrane toward the left until equilibrium is reached.
Selectively Permeable Membranes allow some things across the membrane. For example water and oxygen move freely across the cell's membrane, by diffusion

8. Words to Remember from the Video
Solute
Solvent
Diffusion
Equilibrium
Osmosis
Semi-permeable membrane
High/ Low concentration

9. Photosynthesis Definition
Def: Production of oxygen and sugar from solar energy, water and carbon dioxide
Needs: chloroplast
Equation:
Solar Energy + water + CO2  Oxygen + glucose

10. Draw:

11. Cellular Repiration Definition
Def: Production of energy, water and carbon dioxide from oxygen and sugar.
Needs: mitochondria
Equation:
Oxygen + glucose  CO2 + water + energy

12. Draw:

13. How Photosynthesis & Cellular Respiration Relate

14. Microscope

15. Microscope