Transport In Cells

Passive Transport
- Diffusion
- Facilitated Diffusion
- Osmosis
- No Energy Required
Diffusion(def.)

net movement of molecules form a region of high concentration to lower concentration
Diffusion
- Concentration Gradient: molecules move down this (how much)
- Equilibrium: diffusion molecules reach this when they are evenly spread out
- Passive: no energy needed
How to Change the Rate of Diffusion
- 1. Change the concentration gradient
- 2 Increase the temperature
- 3. Increase surface area
- 4. Change the type of molecule diffusing
- Oxygen, Carbon Dioxide, Water= Diffuse Easily
Facilitated Diffusion
- high to low
- no energy for =
- protein channel (integral)
- large molecules
Osmosis
- diffusion of H₂O
- movement of H₂O from high to low
- concentrations have to be the same on both sides
- same % of solution
Hypotonic Solution
- concentration inside cell is greater than outside
- more water enters the cell than is leaving the cell
- hypo-hippo
- swells
Isotonic
- concentration inside cell is equal to outside cell
- same size
- water entering=water leaving
Hypertonic
- concentration inside the cell is less than outside the cell
- more water leaving cell than entering cell
- shrinks
Animal v. Plant(Hypo/Iso/Hyper)
Examples
- Grocery stores spray water on fruits/vegetables to "plump" them up
- being in water causes fingers/toes to wrinkle when water ENTERS your skin; bathwater is HYPOTONIC compared to your skin

Author

adriana321

243072

Card Set

Transport In Cells

Description

Transport

Updated

2013-10-27T03:13:16Z

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