cell membrane Flashcards
what does cell membrane do
flexible and allows a unicellular organism to move
what does cell wall do
gives the cell structure
homeostasis means
a balanced internal condition of cells (happy state)
homeostasis is also called
equilibrium
homeostasis is maintained by
plasma membrane controlling what enters and leaves the cell
diffusion means
molecules moving in or out of the cell
osmosis means
diffusion specifically for water
Functions of plasma membrane or cell membrane
Protective barrier
Regulate transport in and out of the cell
Allow cell recognition
Provide anchoring sites for filaments of cytoskeleton
Provide a binding site for enzymes
Interlocking surfaces bind cells together (junctions)
Contains the cytoplasm (fluid in cell)
polar heads are
hydrophilic
hydrophilic means
water loving
nonpolar tails are
hydrophobic
hydrophobic means
water hating
the membrane being both hydrophilic and hydrophobic makes it
selective in what crosses
hydro____ pass through easily
hydrophobic
hydro_____ do not pass through easily
hydrophillic
materials that are soluble in LIPIDS
pass through easily
solubility means
dissolve
what type passes through the membrane easily
small molecules and hydrophobic
what type is it harder to pass through the membrane and they do not do on their own
Ions, hydrophilic molecules larger than water and large molecules such as proteins
simple diffusion =
passive transport, molecules move from area of high to low concentration
passive transport means
requires no energy
diffusion =
passive process,
they have a natural kinetic energy
EXAMPLE OF EVERYTHING
If there’s high concentration outside cell and low inside the cell will take in that substance in order to match the concentration with outside and reach homeostasis
osmosis
-Diffusion of water across a membrane
- Moves from high water potential (low solute) to low water potential (high solute)
Isotonic =
- when water and solvent concentration match inside and outside the cell (no movement) - the cell is at equilibrium
(If on quiz and no movement say no net movement)
Hypotonic
when more water outside than inside the cell and it gets bigger if too much water it bursts
science word for burst -
lyse
Hypertonic
cell has more water inside than out, water moves out cell shrinks