Unit 2 Flashcards
Epithelial cells
Skin cells that do not live very long
Plasma membrane helps with what
Ensures cells structure integrity
Regulates flow of materials into/ out of cell
Maintain chemical composition of the cytoplasm
Participated in cellular communication
Forms a cellular identification system
Aids in the cell metabolic process
Glycoprotein
Sugar hooked up with protein/ any class of proteins that have carbohydrate groups attached to the polypeptide chain
Fluid mosaic model
Explains various observations regarding the structure of functional cell membrane. Also shows what’s floating in the cell membrane ( proteins such as phospholipids and sometimes cholesterol float)
Mosaic
Bunch of things put together
What are some functions of the membrane proteins
Transport Enzymatic activity Signal transduction Cell-cell recognition Intercellular joining Attachment to the cytoskeleton and extracellular
What role do phospholipids play in the cell membrane
They form the majority of the molecules
They form a bilayer when surrounded by water
Selective permeability
Selective about what is let’s in the cell. This is important so it does let let anything harmful in
Diffusion
Molecules have instrinsic kinetic energy which allows them to diffuse or spread out; net movement of molecules is from an area of high concentration of the substance to a low concentration until an equilibrium is reached
Concentration gradient
A depiction of the movement of a substance from either a low to high or high to low area of concentration. Usually uses a triangle from base as high to tip being low
Passive transport
Simple diffusion across membrane For example oxygen or urea
Osmosis
Diffusion of solvent across selectively permeable membrane from a low concentration of solutes to a high concentration of solute
Hypertonic solution/ environment compared to cell
Water from cell will be flowing from cell to higher concentration of solutes to create an equilibrium
Hypotonic solution/ environment compared to the cell
Diffusion of solvent across the cell membrane to the area in the cell of higher solute concentration to reach an equilibrium
Isotonic
Both cell and solution contain equal solutes compared to each other
osmotic pressure
The pressure that would be needed to be applied to a pure solvent to prevent it from passions into a given solution by osmosis. Mostly used to express the concentration of a solution
Crenated
A process from the result of osmosis that causes a red blood cell in a hypertonic environment to undergo shrinkage
Cell walls are mainly composed of?
Cellulose -chains of glucose monomers-polysaccharide