Cell Transport

Three Main parts to an Animal Cell Cell (plasma) Membrane Cytoplasm Nucleus

Organelle Review https://www.youtube.com/watch?v=rABKB5aS2Zg

Organelle Websites http://interactivesites.weebly.com/cells.html http://fau.pearlashes.com/anatomy/Heandouts/Study%20Guide%20Cell%20Structures%20of%20Animal%20Cells.htm http://www.cellsalive.com/cells/3dcell.htm

The Nucleus Function: Controls cell activity Contains the cells genetic information Are NOT found in all types of cells yet some cells have several Why? Controls cell activity contains the cells genetic info (chromosomes)

The Mitochondria Function: ATP production Cristae allow for ATP production Number of mitochondria will vary between cells, it depends on the type of the cell Cristae allow for several chemical reactions that allow for ATP production

Lysosome Contains digestive enzymes Function: Destroys unneeded cellular material

Permeability of Cells Lab Which cell structure did the sandwich bag represent? What happened to the starch inside the sandwich bag after it had been soaked for 20 minutes? What about after soaking for twenty four hours? What happened to the water in the container after the bag of starch had been soaking for 20 minutes? What about soaking for twenty four hours? Iodine turns purple-black in the presence of starch. What process (osmosis or diffusion) do you think occurred that caused the results you observed? How do you know this? Was there a net movement of molecules? If so, which direction did the molecules move? How do you know this?

Membrane Structure and Function POGIL Review What is the function of cell membrane? Which type(s) of molecules are allowed to cross the cell membrane? What is the cell membrane made up of? Allows certain molecules to enter and leave the cell. Small non-polar molecules are able to cross the membrane. The cell membrane is made up of phospholipids, carbohydrates and proteins.

Membrane Structure and Function POGIL Review Diffusion Does this require energy? Why or why not? Which molecules are able to cross the membrane? No, because the molecules are moving along the concentration gradient. Lipid soluble substances are able to cross the membrane. Lipid soluble molecules include: oxygen, carbon dioxide, fatty acids, nitrogen gases and fat soluble vitamins (A, D,E and K) Diffusion http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html

Always Remember “Molecules go with the flow from high to low” During diffusion “Molecules go with the flow from high to low”

Membrane Structure and Function (POGIL Review) Facilitated Diffusion Which molecules pass through the channel? What enables them to cross? Facilitated Diffusion: Membrane proteins assist molecules across via channels or carriers.

Active Transport Define active transport Is energy needed? Why? What type of molecules are transported?

The Na+K+ Pump Protein that brings in K+ ions and kicks out Na+ ions http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/ Protein that brings in K+ ions and kicks out Na+ ions Why is the pump constantly working? Is this an example of active transport or passive transport? Ideally the cell wants a low conc of Na in the cell and a high conc of K, Ions slowly leak back and the pump must continually maintain the balance http://www.youtube.com/watch?v=GTHWig1vOnY

Endy, exo and phago

Osmosis Define osmosis Is this passive or active transport? Why? The diffusion of water across a membrane

Osmotic Movement Lab Things you should know: Your hypothesis should include both the independent and dependent variable and should center around how you know molecules are moving and which direction they are moving in You should read your background to create your hypothesis, maybe this will help you http://www.youtube.com/watch?v=HqKlLm2MjkI

Osmotic Movement Review Osmotic Condition Direction of water movement Effect on the cell Picture Isotonic Hypotonic Hypertonic

Cell Transport Analysis Based on what you learned in class today, was this an example of diffusion, osmosis, endocytosis, exocytosis or phagocytosis? Explain your answer. Describe how white blood cells attack germs in the body. Which type of cell transport is this an example of? Why do cells need to use active transport?

Facilitated Diffusion Molecular Movement   Active Transport Passive Transport Diffusion Facilitated Diffusion Requires energy input by the cell Molecules move along (down) a concentration gradient Moves molecules against (up) Always involves channel (membrane-spanning)proteins Molecules pass between the phospholipids Moves ions like Na+ and K+ Moves large molecules Moves small nonpolar and polar molecules