Unit+Two+Homeostasis+and+Transport

Homeostasis and Transport

Keystone Standards: A.4.1.1 Describe how the structure of the plasma membrane allows it too function as a regulatory structure and protective barrier for a cell. A.4.1.2. Compare the mechanisms that transport materials across the cell membrane Try out the quizzes on the McGraw Hill website. || Sodium/Potassium Pump: Neurons send messages electrochemically; this means that chemicals (ions) cause an electrical impulse. Neurons and muscle cells are electrically excitable cells, which means that they can transmit electrical nerve impulses. Neurons need a chemical gradient in order to generate an impulse and must use the Na+K+pump to create this difference. 3 Na+ molecules are pumped out of the cell while 2 K+ are pumped in with the help of ATP. When this occurs, the region outside of the cell is more charged than inside and cell can conduct the electrical impulse.
 * [[image:osmosis.png width="257" height="199" caption="Osmosis" link="http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html"]] || [[image:fd.png width="263" height="220" caption="Passive Diffusion" link="http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html"]] ||
 * [[image:na.png width="281" height="226" caption="Active Transport" link="@http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter38/sodium-potassium_exchange_pump.html"]] || [[image:elodea.png width="286" height="245" caption="Cells in Hypertonic solution" link="@http://www.csun.edu/scied/7-microscopy/elodea_plasmolysis/index.htm"]] ||
 * [[image:endo.png width="264" height="201" caption="Endocytosis" link="http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__phagocytosis.html"]] || Use these links as a tutorial on active and passive transport.



Keystone Standards:

A.4.2.1. Explain how organisms maintain homeostasis( e.g., thermoregulation, water regulation, oxygen regulation) @http://cdl.panam.edu/courses/biol1402/summy/ch44.htm || @http://cdl.panam.edu/courses/biol1402/summy/ch44.htm ||
 * || some sources ||
 * Osmoregulation || Text pg119 (cactus), 843(reptiles), 982(humans)
 * Thermoregulation || Text pg -843, 848 Reptiles
 * CO2-O2 Regulation || Text pg 618(plants), 678 (fish); 825-26 Reptiles/Amphibians; 944-46 humans ||