Transport in the Cell

1. Transport in the Cell Active and Passive Transport

2. How can molecules move through cells? • Semi-permeable membrane: allows certain molecules to move in or out depending on their properties • Ex: if they are too big, they can’t go in easily • Membrane is made of (composition): • Bi-lipid layer • 2 layers of lipids • Proteins that transport materials across • Carbohydrates that act as identifiers

3. Fluid Mosaic Model-membrane is a fluid with a bunch of different components

4. Before we begin you must understand…. • Concentration-how much solute is in a solvent • Why must molecules move? • To maintain homeostasis • Homeostasis-state of balance in which the internal body remains in a normal range • Molecules must move to maintain this

5. Biology 11/5 HW-Concept Map • Take out 7.3 wkst and 7.3 notes. • Pick up your binder in the back. Put 7.3 reading guide in wkst section.

6. 2 types of transport in the cell • Passive transport • Molecules move down the concentration gradient • Area where there is a lot of molecules to where there is very little • Energy involved: NO • Active transport • Molecules move up the concentration gradient • Area where there is a few molecules to where there is a lot • Energy involved: YES

7. Movie Timehttp://www.brainpop.com/science/matterandchemistry/diffusion/Username: cvbrainpopPassword: cheetah1

8. Type of Passive Transport Diffusion-movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached • Equilibrium-equal distribution • Molecules will move equally after this is reached. • Simple molecules can move • Carbon dioxide, oxygen

9. Passive transport

10. Osmosis-Type of passive transport • Water moves from an area of high concentration to an area of low concentration • No energy involved • AKA: diffusion of water

11. Hypertonic and Hypotonic • Hypotonic-More water outside the cell than inside • Distilled water • Water comes into the cell • Why? To balance out the concentration of solutes • Hypertonic-More water inside the cell than outside • Salt water • Water leaves the cell • Why? to balance out the concentration of solutes

12. Isotonic • Molecules are equal inside and outside the cell • Molecules move evenly across the membrane

14. Biology 11/14 HW-finish concept map Agenda: Stations; finish notes You should be: • Take out 7.3 notes • Take out paper with station information.

15. Station Exploration • You will visit different stations. • At each station, there will be directions telling you what conditions each item was place in or what to do with each item. • On your paper, you need to write down a brief description of what you see and why. • Examples of answers for why: hypertonic, hypotonic, diffusion, osmosis, decrease in turgor pressure, molecule movement

16. Why is water so important to a plant? • Water fills the vacuole and the contents of the cell are pushed against the cell wall • Produces turgor pressure • Gives the plant rigidity and the ability to stand erect

19. Facilitated Diffusion-3rd type of passive transport • Molecules move from an area of high concentration to an area of low concentration with the help of a carrier protein • Molecules attach to a specific protein • The protein allows it to move through the membrane • Needed when molecules are too big or have an electrical charge (ions!!) • Glucose (large molecules), Na+, Ca+, K+, Cl-

21. Active Transport-A reminder! • Requires energy from the cell • Move molecules from an area of low concentration to high

22. Endocytosis • Process for bringing things into the cell • Used for large particles (bigger than molecules, still microscopic) • Requires energy

24. “Cell Eating” Very large particles taken in by cell (engulfed) “Cell Drinking” Small bits of liquid or other substances taken in Pinocytosis Phagocytosis

26. Exocytosis • Process for moving large amount of material out a cell

28. Movie Timehttp://www.brainpop.com/science/cellularlifeandgenetics/activetransport/Username: cvbrainpopPassword: cheetah1

29. Bio 11/13HW-finish wkst; Lab due Friday; test and flashcards Friday (25 from 7.3 and 10 from 7.4)1. Turn in analysis questions. Put transport review in wkst section. This is a great study tool for the test. Put lab info in lab section.2. Take out 7.4 notes-we will finish this.

30. Movie time • http://www.brainpop.com/science/cellularlifeandgenetics/passivetransport/ Username: cvbrainpop Password: cheetah1

31. Section 7.4 • Unicellular-one celled • Bacteria, algae, yeast • One cell does all the work • Multicellular-many celled • Plants, humans • Specialized cells do certain things

32. Specialization • Cell develop differently to perform different tasks • All cells at one time in your body are the same (stem cells) • Then they differentiate in fetal development • Become different cells with different functions • Muscle cells-allow movement • Red blood cells-carry oxygen • Guard cells in plants open and close stomata on a leaf.

33. Smallest level Group of tissues Group of similar cells Group of organs that perform a specific function Largest level