3 – Cell Membrane/Body Organization Flashcards
The cell membrane helps carry out_
homeostasis
the_controls what goes into and out of the cell
cell membrane
what is homeostasis?
The balance between the cell and its environment
The cell membrane is selectively_
permeable
when somethings can go through the cell membrane and others cannot, this is controlled by the size, polarity, And concentration of the molecule. What is this definition?
selectively permeable
small_molecules easily pass through the cell membrane
Nonpolar
small polar molecules are transported via_in the cell membrane
proteins
large molecules are moved through_
vesicles
lipid layer, also called_, is embedded with proteins
phospholipids
those made of_fats are more fluid than those made of saturated fat’s
unsaturated
_Molecules help maintain the stability of the cell membrane
cholesterol
The membrane is embedded with proteins which… List three things of the proteins do.
actors channels for materials, Key components of the cytoskeleton, different cell types have different membranes
_Attached to the membrane proteins serve as identification tags
carbohydrates
_Detect a signal molecule and perform an action in response
receptors
_Is the molecule that binds to a receptor
ligand
_Is a receptor found inside the cell
intercellular receptor
_Is a molecule that cannot cross the membrane, will bind to receptors on the membrane surface; the entire receptor changes shape, causing the molecules inside the cell to respond
membrane receptor
_Is the random movement of molecules from an area of highconcentration to an area of low concentration
diffusion
diffusion is the random movement of molecules from an area of_concentration to an area of_concentration
high to low
_Is the diffusion of water molecules across the cell membrane until equilibrium has been reached
osmosis
osmosis is the fusion of_molecules across the cell membrane until equilibrium has been reached
water
Diffusion results and a dynamic_
equilibrium
_Transport is the direction that molecules will move is dependent on the concentration that are present in the solution and in the cell
passive
what are three types of solutions surrounding the cell or there?
isotonic, hypertonic, hypotonic
isotonic solutionshave the_number of dissolved solids inside and outside the cell
same
hypertonic solutions there are more dissolved solids_the cell then_
- outside
2. inside
hypotonic solution there are more dissolved solids_then_
- inside
2. outside
which way does hypertonic solutions move?
move outside
which way do hypotonic solutions move?
into the cell
_Is the movement of molecules with the help of the protein carrier
facilitated diffusion
in facilitated diffusion molecules move from an area of_concentration to an area of_concentration
high to low
_Transport is the movement of molecules from a region of lesser concentration to a region of higher concentration
Active
what is an example of active transport?
pumps. Sodium/potassium
_Has to have energy for it to occur
Active transport
in active transport a transport_binds with the molecule to be transported
protein
_Changes the shape of the molecule so that it can be brought across the membrane in active transport
Energy
_Transfer is the transfer of large molecules across the membrane
bulk
what two types of bulk transport are there?
endocytosis and exocytosis
_Is a taking in of large solid particles
endocytosis
_Is the removal of large particles from the cell
exocytosis
_Is the taking of large solid particles
phagocytosis
_Is the taking of liquid droplets
Pinocytosis
_Transport requires no energy
passive
_Transport requires energy
Active
in_molecules move from high to low
diffusion
and_diffusion help or molecules move molecules from high to low
facilitated
in_is the diffusion of water and it moves from high to low
osmosis
in_osmosis salutes is equal inside and outside the cell
isotonic
in_osmosis dissolved solids are higher outside the cell than inside
hypertonic
in_osmosis less dissolved solids outside the cell then inside
hypotonic
pumps use a membrane proteins to bring molecules across the cell membrane from_to_
Low to high
