- Slides: 23
Cell Transport: ACTIVE TRANSPORT Active transport Passive
Standard S 7 L 2. a. Explain that cells take in nutrients in order to grow and divide and to make needed materials. S 7 L 2. 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.
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 transport.
What happens? • Transport proteins bind with large molecules. • cellular energy is used to move through membrane.
Draw this example under #2 Cell membrane low (ATP) high
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.
Stop and Review Active transport involves: • Uses energy molecule ATP • Uses transport proteins. • Molecules move from a low concentration to a high concentration against the gradient.
• When would a cell need active transport to move nutrients and/or waste from a cell? – When the molecules are too large to pass through the cell membrane and too large for a transport protein.
4. So what happens if… a particle is too large for a transport protein to assist it through the cell membrane? See next slide for answer. .
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 contains the particle. Draw slide on next page…
Draw this picture of endocytosis High concentration of solute Uses ATP Cell membrane Vacuole/vesicle Goes against the concentration gradient – low to high
Give this a few seconds to work!
Stop and Review • Endocytosis involves: – Bringing Large Substances INTO the Cell. – The membrane surrounding the substance is made from part of cell membrane. – Creates a vacuole/vesicle
6. 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. Draw slide on next page…
Draw a picture of exocytosis Cell membrane High concentration of solute Uses ATP Particles released out of cell Goes against the concentration gradient – low to high
Stop and Review Exocytosis involves: • Releasing Large Substances OUT of the Cell • The membrane surrounding the substance becomes part of cell membrane after it releases it out of the cell.
Review of Endocytosis & Exocytosis
Cell Transport Flip Book • Continue working on the cell transport flipbook you created and complete the tabs for active transport. • Label the tabs: – Active Transport – Endocytosis – Exocytosis
For each type of transport, • write a 3 facts to explain what occurs in each type of transport. • draw what is happening in each type of transport. • You will need to work diligently on this to complete it during class.