Cell Defense-The Plasma Membrane 1. Without__cells of living things will die because they are unable to maintain__.: The Plasma Membrane__Homeostasis 2. Phospholipids-Have a __head and 2_ _ Tails.: Phosphate, fatty acid 3. the heads are_ which means_.: Hydrophilic, they like to be close to water. 4. the tails are_which means_.: Hydrophobic,they avoid water. 5. the heads face out towards the_and the tails facing_.: water, each other 6. What do you have to put into the membrane in order to stabilize it?: cholesterol 7. what is another word for selectively premeable?What does this mean.: semi-permeable The membrane allows some substances to pass through easily, but does not allow others to pass. 8. what two molecules easily pass thorugh the membrane, why?: CO2 and Oxygen Both are Non-polar and Small 9. Nonpolar: molecule does not have signifigantly charged ends. 10. small: small molecules pass thorugh the membrane most easily. 11. what 3 molcules cannot easily pass throught the membrane?why?: Sugar-large and polar molcules such as sugars do not pass through the bilayer. Ion+ and ION- = charged substances like IONS do not pass throug h the phospholipid bilayer. 12. Polar: molcule has partial changes. this is because electrons are not shared equally between atoms in the molecule, making some atoms a little bit negative and a little bit positive. 13. you can only transport substances using channel proteins until there weredefine diffusion: equal amounts of it on both sides of the membrane. Diffusion-equal substances on both sides 14. moving from LOW to HIGH concentration requires the use of energy to pump substances.: Active Transport Using: energy(ATP) Carrier Proteins 1/2 15. cells that have different membrane carbohydrates do differnet__.the imune system uses the carbohydrates to __ that your cell belongs to you and are not __,__ or other foreign cells.: jobs,reconize,viruses,bacteria 16. immune system function what kind of cell does this: protects the body from disease kills, and attacks invaders the TCell 17. What is osmosis?: diffusion of water across a selectively permeable membrane movement of water in and out of the cell. 18. what is the name of the cell that lets water pass through? active or passive transport?: aquaporins passive transport 19. Does passive or active transport require energy?: active transport 2/2