3Identify the lipid molecules. Identify the protein molecules. Go to Membrane DiagramIdentify the lipid molecules.Identify the protein molecules.What is a ‘lipid bilayer’?
4-To be Selective Permeable: = Cell Membrane(Plasma Membrane)Function-Helps maintain Homeostasis: = maintain a stable internal environment-To be Selective Permeable: =control what passes in or out of the cell
5Cell MembraneWhat the lipids do…-Act as a lining, separates the chemicals of the cytoplasm from the surroundings
6All to move molecules in & out of the cell! Cell Membrane(Plasma Membrane)What the proteins do…Form a. open channelsb. gated channelsc. active transport pathways,All to move molecules in & out of the cell!
49Active Transport Particles move Across a SPM. Against the concentration gradient.The cells must spend energy.
50(from an area of _____ concentration to an area of ___ concentration) Active transport allows particles to move against the concentration gradient.(from an area of _____ concentration to an area of ___ concentration)LOWHIGH
51An example of Active Transport: All animal cells have a Sodium Potassium pump that pumps sodium (Na+) to the outside of cells and potassium (K+) to the inside of cells.
52This ‘pump’ allows nerve cells to carry electrical messages through the body! Nerve cell