Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Signal transduction wikipedia , lookup
Cytokinesis wikipedia , lookup
Extracellular matrix wikipedia , lookup
Endomembrane system wikipedia , lookup
Tissue engineering wikipedia , lookup
Cellular differentiation wikipedia , lookup
Cell culture wikipedia , lookup
Cell encapsulation wikipedia , lookup
Name: ______________________________________________ Block: ________ Date: ______________ Activity #1 Biology Place: Solutions: Isotonic, Hypotonic, & Hypertonic Log on to www.biology.com Click on: o The Biology Place (on the right side of the screen) o Biocoach o Biomembrane I: Membrane Structure and Function o Concept 2: Osmosis: Movement of Water Across Membranes (on the left side of the screen) Osmosis (movement of water across membranes) depends on the relative concentration of solute molecules on either side of the membrane. The presence or absence of cell walls influences how cells respond to osmotic fluctuations in their environment. Click on Review Looking at the diagram above. Describe the difference between the three types of solutions. The small circles represents dissolved solutes like salt, glucose, and amino acids. You can assume that the additional space surrounding the solutes is water. hypotonic - _________________________________________________________________________________ ____________________________________________________________________________________________ isotonic - ___________________________________________________________________________________ ____________________________________________________________________________________________ hypertonic - ________________________________________________________________________________ ____________________________________________________________________________________________ Click on Next Cells in Isotonic Solution 1. What is the concentration of salt in animal cells? _________________________ 2. When cells are in isotonic solution, is there movement of water into or out of the cell? If so, describe this movement. ____________________________________________________________________ ____________________________________________________________________________________________ 1 Click on Next Cells in Hypotonic Solutions Describe the net movement of water molecules when cells are placed in a hypotonic solution. ____________________________________________________________________________________________ ____________________________________________________________________________________________ Click on A Closer Look A Closer Look at Plant and Animal Cells in Hypotonic Environments **Make sure to ANIMATE the graphics.** What happens to an animal cell when placed in a hypotonic solution? ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ Click Back to Review then Next Cells in Hypertonic Solutions Describe the net movement of water molecules when cells are placed in a hypertonic solution. ____________________________________________________________________________________________ ____________________________________________________________________________________________ Activity #2 Log on to: http://www.concord.org/~btinker/workbench_web/models/osmosis.swf Play with the model by putting the cell in isotonic, hypertonic, and hypotonic solutions. Don’t forget to hit “Reset” and “Update Concentrations” after you adjust intracellular and extracellular contents. Observe how the cell changes or does not change under each condition. Then answer the following questions: Why do hospitals treat dehydrated patients with intravenous saline solution and not water? Explain. _____________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ What would be the health effects if someone lost at sea only drank sea (salt) water for a prolonged period? __________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ 2 Practical Applications of Osmosis: Based on what you have learned about osmosis, find literature resources to help you describe how the following chemicals act as regulators of osmosis in human organ-systems: Caffeine ____________________________________________________________________________________________ ____________________________________________________________________________________________ Sodium Chloride (table salt) ____________________________________________________________________________________________ ____________________________________________________________________________________________ Hydrochlorothiazide (blood pressure medication) ____________________________________________________________________________________________ ____________________________________________________________________________________________ Based on what you have learned about osmosis, find literature resources to help you describe how semi-permeability is very important in membranous systems: The brain’s blood barrier ____________________________________________________________________________________________ ____________________________________________________________________________________________ Absorption through the skin of various substances ____________________________________________________________________________________________ ____________________________________________________________________________________________ Peritoneal dialysis for patients with diseased kidneys ____________________________________________________________________________________________ ____________________________________________________________________________________________ 3