Cellular Transportation Molecules move Movement of Materials- Passive (requiring no ATP) Diffusion- Movement of materials from areas of higher concentration.

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Presentation transcript:

Cellular Transportation Molecules move

Movement of Materials- Passive (requiring no ATP) Diffusion- Movement of materials from areas of higher concentration to areas of lower concentration until dynamic equilibrium is achieved.

Diffusion of Gasses

Selectively permeable- lets some things through but not others

Osmosis- diffusion of water across a membrane Effects turgidity (wilted or not)

Have your book on your desk Start reading 8.1 Have your lab out

Isotonic- equal solution to cell Water will move equally back and forth from the solution to the cell and vice versa. No net movement of water. Cell remains the same size.

Hypertonic- The solution has more solutes than the cell ( less free water) Water will leave the cell and enter the solution. The cell will shrink. Possible crenation.

Hypotonic The solution has less solutes than the cell (more free water). Water will leave the solution and enter the cell. The cell will swell. Possible hemolysis.

Facilitated diffusion Diffusion with the aid of a protein carrier. Does NOT use ATP Example- glucose into cells

Review- osmosis, diffusion, selectively permeable, hypo,iso,hypertonic, turgidity Today – Read Work on w.s. 25min Prep for lab Finish w.s.

Factors effecting movement through membrane. 1. Size 2. Polarity, Solubility 3. Presence of protein transport 4. Surface area availale

Another Passive Movement Filtration-movement by pressure The more pressure the more movement of materials through the membrane

Active Transports Require cell energy 2 types 1 Going against diffusion –Sodium potassium pump

2 Pushing large molecules that cannot pass through the membrane –Endocytosis –Exocytosis

Plasmolysis Plasmolysis video Loss of water from the cytoplasm causing the cell to shrink

Plasma Membrane

Parts of Plasma membrane Glylcoprotein/ markers Lipid bilayer Channels/ pores / Transporters Receptors