getting into and out of cells cell transport. types of cell transport passive transport - no...
Post on 20-Jan-2018
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Types of Cell TransportPassive Transport - no cellular energy required to occur - goes with the concentration gradient
- diffusion- facilitated diffusion
- osmosisActive Transport - requires cellular energy to occur - goes against the concentration gradient
- Endocytosis/Exocytosis - Sodium Potassium Pump
Concentration GradientThe concentration gradient is the
distribution of particles across space from high to low concentration
Passive Transport Energy for passive transport comes from
the molecules themselvesIn passive transport, molecules move with
the concentration gradient - move from high concentration to low
concentration
DiffusionPrimary means of cell transport - molecules move from high to low
concentration - movement continues with the gradient
until the molecules are evenly distributed - equilibrium is achieved
Facilitated DiffusionParticles move with the concentration
gradient across a transport protein in the membrane
- ions, sugar and amino acids all move into and
out of cells by facilitated diffusion
OsmosisThe diffusion of water across a selectively
permeable membrane - water moves from where there is more
water to where there is less water - water moves toward higher conc. of
dissolved material - solute
Three osmotic environmentsHypotonic environment
Little(below) solute/lots of water
What happens when you place cells in an environment that is hypotonic to it? Hmm
Animal Cell Plant Cell
2nd type of Environment
HypertonicLots of solute/little water
What happens when you place a cell in an environment that is hypertonic to it? hmm
3rd EnvironmentIsotonic Environment
Equal amounts of solute and water
What happens to a cell in an isotonic environment? hmm
Isotonic Environment Animal Before Plant
Water Moves In and Out at an equal rate
No Change After No Change
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