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
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Animated Tutorial Transport
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Osmosis

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Passive Diffusion

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Active Transport

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Cells in Hypertonic solution

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Endocytosis

Use these links as a tutorial on active and passive transport.
Try out the quizzes on the McGraw Hill website.
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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.
















Keystone Standards:

A.4.2.1. Explain how organisms maintain homeostasis( e.g., thermoregulation, water regulation, oxygen regulation)


some sources
Osmoregulation
Text pg119 (cactus), 843(reptiles), 982(humans)
http://cdl.panam.edu/courses/biol1402/summy/ch44.htm
Thermoregulation
Text pg -843, 848 Reptiles
http://cdl.panam.edu/courses/biol1402/summy/ch44.htm
CO2-O2 Regulation
Text pg 618(plants), 678 (fish); 825-26 Reptiles/Amphibians; 944-46 humans