Cell Boundaries and Movement

I can explain cellular processes like homeostasis, and cell transport.

Cell Barriers Cell membranes Structure: contain a flexible lipid bilayer with imbedded protein molecules and carbohydrate molecules Function: Substances move across the cell membrane through A.) lipid bilayer B.) protein channels C.) assistance of protein molecules D.) Processes of endocytosis and exocytosis

Cell Barriers Cell Walls Structure: made mostly of tough carbohydrate fiber called cellulose Function: Cell walls support and protect cells; cell walls are porous and allows substances to move through easily

Homeostasis Cell barriers help cells maintain maintain homeostasis Homeostasis is the process by which organisms maintain a relatively stable internal environment.

Types of Movement Through Cells A.) Diffusion B.) Osmosis C.) Facilitated Diffusion D.) Active Transport

Diffusion Substances move across the cell membrane from areas of high solute concentration to areas of low solute concentration until equilibrium is reached No energy required Substances continue to move back and forth across the membrane once equilibrium is reached

Osmosis The diffusion of water across a cell membrane Types of osmotic solutions Hypotonic Isotonic Hypertonic

Concentration Concentration of a solution is the mass of solute in a given volume of solution, or mass/volume A Solute is a substance that is dissolved in a solvent to make a solution

Which way will the water move?

On page 19 Write the definition of diffusion, osmosis and homeostasis Glue the diagrams given to you. Label them Osmosis and Diffusion Write the following questions and answers. In the lungs, the movement of carbon dioxide out of cells and oxygen into cells can best be explained by which of the following processes? a.) active transport b.) diffusion c.) endocytosis d.) osmosis Suzy is going on a date with Billy and she wants to smell pretty, so she sprays on perfume in the bathroom and fragrance starts to fil up the entire house. This would be an example of what type of process? a.) osmosis b.) diffusion c.) phagocytosis d.) pinocytosis