Passive Transport

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Active Transport vs. Passive Transport
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Passive Transport
Goes with the flow with the gradient.
HIGH to LOW
NO Energy needed
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• Concentration amount of a particular substance
  in a given volume
• concentration gradient when one area has a higher
  concentration than another area does, a exists.

NO!!!! Its too crowded get out!
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• Equilibrium is a state in which a system remains
  unchanged over time. A space is filled evenly,
  equilibrium is reached.

A
High to low until equilibrium reached
B

• Passive transport movement across a membrane
  without the use of energy (ATP).

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Modes of Passive Transport
1)Diffusion
Cacaused by temp, pressure, concentration
Only sm particles squeeze through
the diffusion of water through channel proteins
2) Facilitated Diffusion
3) Osmosis
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Types of Osmotic Solutions

• Isotonic
• Hypotonic
• Hypertonic

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Isotonic
Same size
Blood Cell
Plant Cell
11,397x
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Hypotonic
Blood Cell
Plant Cell
13,000x
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Hypertonic
Blood Cell
Plant Cell
13,000x
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• Some unicellular eukaryotes have contractile
  vacuoles, which collect excess water inside the
  cell and force the water out of the cell.
• Animal cells have neither cell walls nor
  contractile vacuoles.
• Many animal cells can avoid swelling caused by
  osmosis by actively removing solutes from the
  cytoplasm.

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Active Transport
Against the gradient.
LOW to HIGH
Requires Energy ATP
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Modes of Active Transport

• 3 sodium ions go OUT
• 2 Potassium ions go IN

• Is an impt carrier proteins in animal cells
• prevents Na from building up in the cell,
• thus preventing osmosis into the cell.

1)sodium-potassium pump
(Na/K ATPase Pump)
Too big to use carrier proteins use these sacs

• Endocytosis takes stuff IN
• Exocytosis takes stuff OUT

2) vessicles
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Sodium Potassium pump
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Endocytosis/Exocytosis
Exocytosis same thingjust EXITS . .er uh
takes it to outside of cell