Transport Quest Review

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Transport Quest Review
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Plasma Membrane

• Draw the structure of the plasma membrane
  including as many components as possible.
• What properties of phospholipids provide the
  special properties of the plasma membrane?

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Plasma Membrane
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Do these get through the plasma membrane? (what
categories of substances can get through?)

• H or Ca
• CO2
• K, Cl-
• H2O
• Glycerol or ethanol (-OH)
• O2
• Amino acids
• Glucose

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Do these get through the plasma membrane?
Lipophilic, non-polar, small

• H or Ca No
• CO2 Yes
• K, Cl- No
• H2O Yes
• Glycerol or ethanol (-OH) Yes
• O2 Yes
• Amino acids No
• Glucose No

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What is this an example of? Explain?
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What is this an example of? Explain?Diffusion
Higher Concentration to Lower conc until reach
equilibrum
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Passive Transport ? High to Low
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Passive Transport ? High to Low

• DIFFUSION

• FACILITATED DIFFUSION

• OSMOSIS

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Describe what is happening in this beaker? Be
complete in your description.
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Describe what is happening in this
beaker?Osmosis movement of water in response
to concentration difference across selectively
permeable membrane.
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Answer the following listing the type of
environment, movement of water, solute
concentration, and condition of cell

• What happens to an animal cell placed in salt
  solution?
• What happens to a plant cell placed in water?
• What happens to an animal cell placed in 0.9
  salene?
• What happens to you if you are stranded and drink
  salt water in the ocean?

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Osmotic Pressure
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Answer the following listing the type of
environment, movement of water, solute
concentration, and condition of cell

• What happens to an animal cell placed in salt
  solution?
• Hypertonic solution- cell will shrivel
• What happens to a plant cell placed in water?
• Hypotonic solution- cell will swell
• What happens to an animal cell placed in 0.9
  salene?
• Isotonic Solution nothing will happen
• What happens to you if you are stranded and drink
  salt water in the ocean?
• Salt water will create a hypertonic environment
  resulting in the loss of water from your body.

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• A homeowner contracts a lawn company to make the
  grass grow better. This process is normally done
  by spraying a mixture of fertilizer and water
  onto the lawn.
• What would happen if too much fertilizer and too
  little water were sprayed onto the lawn?
• What happens to the cells of the grass?
• Was the fertilizer/water mix hypertonic or
  hypotonic to the cells of the grass?

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• A homeowner contracts a lawn company to make the
  grass grow better. This process is normally done
  by spraying a mixture of fertilizer and water
  onto the lawn.
• What would happen if too much fertilizer and too
  little water were sprayed onto the lawn? Lawn
  would dry out and die.
• What happens to the cells of the grass? Cells
  loose water and shrink.
• Was the fertilizer/water mix hypertonic or
  hypotonic to the cells of the grass? Hypertonic

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• What are some examples of active transport?
• Describe the concentration gradient involved in
  active transport
• How is active transport different from passive
  transport?
• Whats happening in this picture?

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• What are some examples of active transport?
  Nervous system/ Na/K pump
• Describe the concentration gradient involved in
  active transport. Low to high against conc
  gradient
• How is active transport different from passive
  transport? Requires energy
• Whats happening in this picture?
  Endocytosis(top), Exocytosis bottom

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Label the Structure of a Neuron
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Structure of a Neuron
4. Myelin sheath insulating membrane increases
speed of impulse
1. Cell body Contains the nucleus and other cell
organelles
2. Dendrites Short, branched
extensions of the cell body Function receive
stimuli
3. Axon long, thin extension of the cell body
Function sends nerve impulses away from the
cell body (Remember A for away!)
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Nervous System

• Describe what types of nerves are involved
  (sensory and motor) and how they work together
  when you stub your toe on a desk.

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Action potential

• You are a potassium ion. There is a new sodium
  ion hired to work in the axon. Your job is to
  describe to the sodium ion their job
  responsibilities in resting potential and action
  potential.
• Don t forget to tell them about
• Threshold
• charge differences in the membrane
• how the signal is communicated to the next neuron!