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Transcript
Name:_______________________________ Date:__________ Review Packet Lesson 4.1 Section: 6-_____ Vocabulary: Osmosis- Is the diffusion of water through a cell membrane. Diffusion- Is the movement of particles from an area where their concentration is high to an area where their concentration is low Endocytosis- The process in which a cell membrane surrounds a particle and encloses it in a vesicle to bring it into the cell Exocytosis – The process used to remove large particles from a cell; during exocytosis, a vesicle containing the particles fuses with the cell membrane. Passive Transport – The diffusion of particles through proteins in the cell membrane from areas where the concentration of particles is high to areas where the concentration of particles is low Active Transport – The movement of particles through the proteins in the cell membrane against the direction of diffusion; requires cells to use energy Solutes- are substances like salt and sugar. Review: The exchange of materials between a cell and its environment takes place across cell cell membrane. Water is the substance used during osmosis. Osmosis is a type of passive transport. Water molecules do not need energy to enter the cell. Large particles (protein) have a hard time entering the cell. The cell uses active transport; this requires energy). The cell membrane is a semi permeable membrane; not all particles can go through. Hypertonic has a high concentration of solutes. Water moves to the grater solute concentration. Hypotonic has a low concentration of solutes. Isotonic is when the concentration is at equilibrium (balance). Example: IV fluid Osmosis in Real Life: If a person received regular water in his/her IV, what would happen to the red blood cells? Why does this happen? The red blood cells would swell. This would happen because the reb blood cell has a higher solute concentration. Water moves to the higher solute concentration. When it is snowing, trucks put salt on the ground. What happens to the plants on the ground when the salt is added? Why does this happen? When salt is added to a plant, the salt will cause the plant to wilt. The water will leave the plant because the salt outside the plant has a higher solute concentration. How is a cell membrane like a screen? (think of the lab we did) The cell membrane is like a screen because only somethings can get through a screen; just like the cell membrane. Large particles (like protein) are too big to fit through the cell membrane.