thin flexiable barrier that protects all cells, regulates what comess in and out of the cell
cell wall
a strong supporting layer outside the cell membrane
lipid bilayer
doublelayerd sheet coposes cell membranes
concentration
the mass of a solution in any given volume
diffusion
move from an area that is more concentrated to a area that is less concentrated
equilibrium
concentration is the same throughout
osmosis
diffusion of waer through a selectively permeable membrane
isotonic
concentration is the same "same strength"
hypertonic
the more contraded one "above strength"
hypotonic
dilute "below strength"
facilitated diffusion
the cell membrane channels are said to facilitate the diffusion of sugar across the membrane
active transport
materials moved in opp. direction
endocytosis
process of taking material into a cell pockets of the cell membrane
phagacytosis
"cell eating" extensions of the cytoplasm surround a particle and package it in a food vacuole
phocytosis
tiny pockets from along the cell membrane fill with liquid and pinch to form vacuoles
exocytosis
process where the membrane of the vacuole surrounding the material fuses with with the cell membrane
cell specialization
cells throughout a organism can develop in different ways to preform different tasks
organ
many groups of tissue work together
organ systems
a group of organs that work together
tissue
a group of simillar cells that preform a particular function
robert hooke
who looked under a microscope at cork and discoverd cells
Anton van leeuwenhook
who observed living pond water through a simple microscope
matthias schleiden
who concluded that all plants are made up of cells
Theodor Schwann
who concluded that all animals are made up of ccells
Rudolph Virchow
who proposed that cells come from existing cells
-all living things are composed of cells
-cells are the basic units of structure and function in living things
- new cells are producedfromexisting cells