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Cell Transport (RS5)

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  • ____ pumps help transport materials from one side of the cell membrane to the other.
    protein
  • The process that brings food or oxygen to the cell is...
    endocytosis
  • If a red blood cell is placed in a hypertonic environment the water will move ____ the red blood cell.
    out of
  • Active transport requires ____ while, passive transport does not.
    energy
  • Since water is repelled by the ____ tails of the phospholipid, the phospholipid bilayer is only partially permeable to water.
    hydrophobic
  • Which part of the cell membrane allows substances like calcium ions to cross?
    protein channels
  • Osmosis causes ____ pressure in plants to provide strength/support and prevent them from wilting.
    turgor
  • The process that removes wastes from the cell is...
    exocytosis
  • What can enter the cell actively through pinocytosis?
    fluids/liquids
  • What regulates the movement of materials into and out of the cell?
    cell membrane
  • If a red blood cell is placed in a hypotonic environment the water will move ____ the red blood cell.
    into
  • ____ is the relatively constant internal physical conditions of an organism.
    homeostasis
  • ____ occurs because molecules constantly move and collide with one another.
    diffusion
  • Each cell must maintain homeostasis in ____ organisms.
    multicellular
  • Too little water in the cell will cause the cell to shrink - the percentage of water is lower outside the cell than inside the cell...which environment is described?
    hypertonic
  • A contractile vacuole is used to remove excess water in a ____ organism.
    unicellular
  • Your fingers shrivel up when you swim in the ocean because you are in a ____ environment.
    hypertonic
  • Small molecules can pass from one side of the membrane to the other by going between the ____ molecules.
    phospholipid
  • A(n) ____ environment leads to homeostasis.
    isotonic
  • Too much water in the cell will cause the cell to burst - the percentage of water is higher outside the cell than inside the cell... which environment is described?
    hypotonic
  • Give an example of maintaining homeostasis.
    ex) deer seeking salty foods to add to its diet; turtle sitting for hours on a sunny rock; jogger stops to drink water
  • Large, solid ____ particles are brought into the cell actively by phagocytosis.
    food
  • How could your body maintain homeostasis when your temperature reaches a cool 97.5 degrees (F)?
    shivering
  • When the concentration of molecules on both sides of the membrane is the same during diffusion, do the molecules ever stop moving across the membrane?
    NO
  • What environment will cause water to move in and out of a red blood cell equally?
    isotonic
  • A hypertonic environment will eventually lead to ____ or ____ when the cell shrinks.
    plasmolysis; crenation
  • What would happen to an animal cell with an internal salt concentration of 0.3% if it were placed in a solution with a salt concentration of 0.9%?
    plasmolysis (cell shrinking) because water would leave the cell
  • Large molecules sometimes enter the cell by way of an...
    involution
  • A large molecule that can't cross the phospholipid bilayer but can cross the membrane passively does so by ____ diffusion, requiring membrane proteins.
    facilitated
  • This means of particle transport requires ENERGY from the cell...
    active transport
  • Substances diffuse passively from a ____ to _____ concentration.
    high to low
  • A ____ environment can lead to cytolysis (cell bursting).
    hypotonic
  • In diffusion, once the molecules are evenly distributed within a given area, a state of ____ is reached.
    equilibrium
  • Osmosis occurs through a ____ membrane.
    semipermeable
  • The diffusion of water across a semipermeable membrane...
    osmosis
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