The Cell in its Environment

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The Cell in its Environment
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The Cell in its Environment

• Draw a lipid bi-layer (selectively permeable
  membrane)

Lipids
Transport Proteins
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The Cell in its Environment

• 1. Selective Permeability This means that some
  substances are allowed into a cell and others are
  not. Permeable means to pass through.

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The Cell in its Environment

• 2. Two ways substances move in and out of cells
  Passive and Active Transport

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The Cell in its Environment

• 3. Passive Transport Movement of material
  through a cell membrane where energy is not
  required
• a. Diffusion the movement of molecules from
  an area of higher concentration to an area of
  lower concentration. Example pond water
  organisms survive because oxygen in the pond
  water is at higher levels than inside the organism

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The Cell in its Environment
DIFFUSION
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The Cell in its Environment

• b. Osmosis the passing of water molecules in
  and out of the cell by diffusion

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The Cell in its Environment

• 4. Isotonic Solution the concentration of water
  outside and inside the cell is equal

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The Cell in its Environment

• 5. Hypotonic Solution the concentration of
  water outside the cell is greater than the
  concentration of water inside the cell therefore
  water will flow into the cell, causing it to swell

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The Cell in its Environment

• 6. Hypertonic Solution the concentration of
  water outside the cell is lower than the
  concentration of water inside the cell therefore
  water will flow out of the cell, causing it to
  shrink

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The Cell in its Environment

• 7. Active Transport the movement of material
  through a cell membrane where energy is required

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The Cell in its Environment

• a) Engulfing the cell membrane pinches in to
  form a vacuole inside the cell

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The Cell in its Environment

• b) Transport Proteins transport proteins in the
  cell membrane can pick up molecules outside the
  cell and carry them into the cell