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chapter 4 human pers

endocytosis cell takes in materials by enfolding and enclosing them; includes phagocytosis and pinocytosis
endoplasmic reticulum Network of membranes forming channels through the cytoplasm of a cell
carrier-mediated transport transport of ions or molecules across a cell membrane by special proteins
vesicular transport transport of materials into or out of a cell in membrane-bound sacs
fluid mosaic model currently accepted model of a cell membrane structure
facilitated diffusion carrier proteins assist the movement of substances through the cell mebrane
hydrophobic tail of a phospholipid, water hating
hydrophilic head of phospholipid, water loving
lipid Large organic Molecules made up of fatty acids and glycerol
microtubules Fine tubes that help to maintain the shape of the cell and hold organelles in place
osmosis diffusion of water molecules through a deferentially permeable membrane, form high to low concentration
osmotic pressure pressure due to differences of concentration on either side of the membrane.
passive processes no input of energy
concentration/diffusion gradient A difference in concentration of a solution between the inside and outside of the cell
phagocytosis cell surrounds, takes in, solid particles
exocytosis the contents of the vesicle of a cell are pushed out though the cell membrane
diffusion movement of particles of a liquid or a gas so they are evenly distributed over the space available
active processes a process that needs energy
Active transport the use of energy to move substances, ions across the cell membrane
bilayer Two layers that make up a single membrane
cell membrane forms the external boundary of a cell
channel proteins proteins that allow ions, small molecules and water to pass through the cell membrane
deferentially permeable permits the passage of certain substances but restricts the passage of others
phospholipid lipid molecule containing a phosphate group
pinocytosis which a cell enfolds, takes in, drops of liquid
homeostasis relatively constant environment in a cell, despite external environment
vesicles small membrane-bound cavity in the cytoplasm, smaller than a vacuole
golgi body structure in the cytoplasm of a cell consisting of a stack of flattened channels
tissue/extracellular fluid fluid found in the spaces between the cells
Created by: keavyh1



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