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Week 3 Worksheet

Week 3 Worksheet -...

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BILD 2, Professor Fortes Handout 2 TA: Anna Gruzman ( [email protected] ) 10/12/10 Electrochemical Gradients: 1. In order to cause depolarization what ion channels would you have to open in a cell membrane? What are the forces driving this (Hint: What is the resting membrane potential of the cell)? 2. In order to cause hyperpolarization what ion channels would have to open in a cell membrane? What are the forces driving this? 3. If we have Potassium leak channels open that let potassium leave the cell down its concentration gradient what prevents an indefinite build up of negative charge? 4. How is the Sodium/ Potassium Concentration gradient maintained?
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Action Potentials: 5. What channels are opened and closed at each point (a, b, c, d) and what does that mean in terms of refractory periods?
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Unformatted text preview: http://content.answcdn.com/main/content/img/oxford/Oxford_Sports/0199210896.action-potential.1.jpg http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html Propagation of Action Potentials 6. Why is it important to have refractory periods? Explain in terms of propagation of charge. What would happen if you generated an action potential in the middle of the axon (instead of the hillock)? Could it go backwards, why or why not? The Result of Action Potentials: Neurotransmitters and chemical synapses 7. What happens when an action potential reaches the synaptic terminal? Does this always lead to the depolarization of the post synaptic cell? http://www.youtube.com/watch?v=HXx9qlJetSU&feature=related...
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