Warm Up 10/14/15 What does it mean to go with or down the concentration gradient? How would riding a bicycle down a hill be like passive transport?

Cell Transport: ACTIVE TRANSPORT Active transport Passive transport

Standard S7L2.a. Explain that cells take in nutrients in order to grow and divide and to make needed materials. S7L2.d. Explain that tissues, organs, and organ systems serve the needs cells have for oxygen, food, and waste removal.

1. Active Transport Unlike passive transport which does NOT require energy, active transport DOES require energy. Active transport requires the molecule ATP for energy. This molecule is produced in the mitochondria.

Lets see if this helps… https://www.youtube.com/watch?v=prfMUwjobo8 https://www.youtube.com/watch?v=9BU7MDFvDhA

2. Transport Proteins Active transport uses transport proteins. In active transport, molecules move from areas of low concentration to areas of high concentration. This is opposite of passive.

What happens? Transport proteins bind with large molecules. cellular energy is used to move through the membrane.

3. Concentration Gradient Molecules move against the gradient from low to high. The transport protein releases the molecule. The transport protein is free to bind with another molecule.

Draw this example under #3 Low high

Stop and Share Active transport involves: The use of energy (the molecule ATP) The use of transport proteins. Molecules move from a low to a high concentration (against the concentration gradient).

When would a cell need another form of active transport to move nutrients and/or waste from cell? If a molecule is too large for the transport protein to help it through the cell membrane.

4. What happens if… a particle is too large for a transport protein to assist it through the cell membrane?

ENDOCYTOSIS and EXOCYTOSIS

5. Endocytosis Endocytosis is the process of taking substances into a cell by surrounding it with the cell membrane. This creates a vacuole or vesicle (which is a small vacuole) that surrounds the particle.

6. Draw a picture of endocytosis Uses ATP Cell membrane Vacuole/vesicle Goes against the concentration gradient – low to high

Stop and Share Endocytosis involves: ENERGY!! Bringing Large Substances INTO the Cell. The membrane surrounding the substance is made from part of cell membrane. Creates a vacuole/vesicle

7. Exocytosis Exocytosis involves releasing the contents of a vesicle/vacuole out of the cell. This occurs in the opposite way of endocytosis. Explain this in your own words.

8. Draw a picture of exocytosis Cell membrane Uses ATP Particles released out of cell Goes against the concentration gradient – low to high

Stop and Share Turn to someone near you and explain exocytosis. Exocytosis involves: Releasing Large Substances OUT of the Cell The membrane surrounding the substance becomes part of cell membrane

Review of Endocytosis & Exocytosis

Cell Transport Flip Book Continue working on the cell transport flipbook you created. You may look at page 79 in the textbook. In addition, a diagram will be displayed.

For each type of transport, write a few words to explain what occurs in each type of transport. draw what is happening in each type of transport. Refer to page 79 for assistance. You will need to work diligently on this to complete it during class.

Honors You are going to create a story, PowerPoint, Brochure, Comic Book, that explains cell transport. This “creation” should explain the parts of cell transport. This should also contain graphics.

Flipbook You will receive three sheets of paper. We will fold these together. On the cover, write “CELL TRANSPORT.” This is the title. Second: Diffusion and Osmosis Third: Facilitated Diffusion Fourth: Active Transport Fifth: Endocytosis Sixth: Exocytosis