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Warmup

Warmup. Create a chart showing the different types of transport cells use, and draw a picture to go with each if you can. Warmup Solution. Tranpsort Review and Organic Materials. SEPTEMBER 16, 2010. Diffusion (Passive).

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Warmup

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  1. Warmup Create a chart showing the different types of transport cells use, and draw a picture to go with each if you can.

  2. Warmup Solution

  3. Tranpsort Review and Organic Materials • SEPTEMBER 16,2010

  4. Diffusion (Passive) As a result of random motion, things tend to spread from areas of high concentration to areas of low concentration. When a membrane with special pores is involved, it’s called facilitated diffusion because the membrane helps the process along. Ex 1: Chickens escape from a coop and go everywhere. Ex 2: A fart slowly makes its way from the perpetrator to victims in the surrounding area. Ex 3: A drop of dye slowly colors a jar of water.

  5. Osmosis (Passive) Water moves across a membrane from a ‘fresh’ area towards a salty area. A difference in saltiness literally produces pressure across the membrane. Ex 1: A carrot placed in bowl of very salty water loses water through the cell membranes, become smaller and squishy. A carrot placed in a bowl of fresh water gains water through the cell membrane and becomes full and crisp. Ex 2: REVERSE Osmosis is the process of using powerful pumps to push saltwater through a membrane which is impermeable to salt, creating fresh water. This is one method for de-salinization for coastal drinking water.

  6. Exocytosis (Active) A container made of the same materials as the membrane merges with the membrane, and expels from the cell whatever was inside in the process.

  7. Endocytosis(Active) These are the opposite of exocytosis in that the membrane folds around something and then breaks off into the cell. How to remember which direction endo and exo are: Endo sounds like enter Exo sounds like exit

  8. Phagocytosis http://www.youtube.com/watch?v=fpOxgAU5fFQ http://www.youtube.com/watch?v=W6rnhiMxtKU&feature=related Phagocytosis is different than endocytosis in that endocytosis is ‘normal’ but phagocytosis is ‘carnivorous’! Ex 1: A regular cell engulfs some protein, but a white blood cell engulfs a bacteria cell. Ex 2: A little micro-organism eats some spoiling milk, and then a bigger micro-organism eats the little one.

  9. Organic Materials Inorganic Materials Water, salt, minerals, vitamins.

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