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

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

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

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

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

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