Osmosis and Diffusion Vocabulary-

• Selectively Permeable- it selects what molecules can go through

• Cell Junctions- a place on the cell where it connects to another cell

• Solubility- Materials that are soluable in lipids can pass through the cell membrane easily

• Solute- Particles that dissolve into water

• Diffusion- movement of solutes from an area of HIGH to LOW concentration with diffusion molecules move their own kinetic energy.

• Osmosis- is the diffusion of water across a cell membrane

 

Types of Transport: 

1. Simple Diffusion-

   1. Requires no energy to move things across the cell membrane

   2. Molecules were from area HIGH concentration to an area of LOW concentration.

      1. Considered passive, no ATP needed

2. Osmosis-

   1. If water potiential is HIGH, solute concentration is LOW

   2. If water potiential is LOW, solute concentration is HIGH

 

Three Water Solution Types-

1. Hypotonic Solution

   1. the concentration of dissolved substances is lower in the solution outside the cell than the concentration inside the cell.

2. Hypertonic Solution

   1. the concentration of dissolved substances outside the cell is higher than the concentration inside the cell.

3. Isotonic Solution

   1. the concentration of dissolved substances in the solution is the same as the concentration of dissolved substances inside the cell 

 

Passive Transport: 

• Simple Diffusion-

  • doesn't require energy 

  • moves high to low concentration

• Facilitated Diffusion- 

  • doesn't require energy

  • uses transport proteins to move high to low concentration 

• Active Diffusion- 

  • requires ATP or energy 

  • moves materials from low to high concentration against concentration gradient.