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Transcript
TOPIC NOTES Cell Transport Notes Cell (Plasma)Membrane- super thin layer - called cell or plasma membrane - 2 functions → @ the same time 1. Separates the cell from the outside environment 2. Connects the cell to its surroundings by controlling what enters and leaves the cells The Cell Membrane has: two (2) layers (double layer) - 2 layers (Bi-layer) thick - made of lipids (FATS) & Proteins → that constantly are moving * Called Bi-layer Phospholipids 2 lipids face in (Doesn’t like water) Fluid Mosaic Model (1 lipid face out (Likes water) Cell Transport Selective Permeability – allows some substances to past through the (semi-permeable) cell and other substances can’t (mainly based on size) -3 Factors Some substances dissolve easier in fats Size → smaller substances can go thru easier than larger Carrier Proteins → are embedded in the cell membrane & they help more specific mole
