1. Note Taking – Exchange with the Environment
Another reading strategy like close reading with highlighting
Helps you to organize important information
Allows you to analyze or break down more difficult information or concepts/ideas
Helpful for studying
Helpful for creating a summary

2. Exchange with the Environment
What is Diffusion?
Diffusion in Water
The Cell and Osmosis
Moving Small Particles
Moving Large Particles
Endocytosis
Exocytosis

3. Exchange with the Environment
Organisms need to move things in/out of cells (food/energy & waste) to stay healthy
Healthy cells can divide (grow & reproduce)
Diffusion helps cells to accomplish cell division & transfer of things at the cell membrane.
What is Diffusion?
Particles move from
concentrated less concentrated
(crowded) (less crowded)
Happens in cells
Don’t need energy to carry out

4. Exchange with the Environment
Diffusion in Water
Osmosis=the movement of water through cell membrane
Essential for cells life processes
Semipermeable=only certain particles (molecules) move through the cell membrane
The Cell and Osmosis
Osmosis keeps balance within cell
Cells in salty solution = water will leave cell
Cells lacking water = absorb water around it

5. Exchange with the Environment
Moving Small Particles
Particles move through cell membrane passageways (channels)
Passive Transport=no energy needed
High concentration low concentration
Diffusion and osmosis
Active Transport=use energy
Low concentration high concentration

6. Exchange with the Environment
Moving Large Particles
Endocytosis=active transport
Ex. Cells surrounding a protein in a vesicle to move into cell
Exocytosis=active transport
Ex. Cell surrounds waste in a vesicle to move out of cell