Handout 2

Handout 2 - b Define the activation threshold and explain...

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TA: Anna Gruzman Section 2 E-mail: [email protected] 1/18/10 1. Explain why there is no current generated in graph A. Explain what causes the positive and negative current in graph B. 2. Explain why at a voltage of 70 and 90 the curve shows only positive (outwards) current and account for the dip that occurs at roughly one ms.
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http://www.nernstgoldman.physiology.arizona.edu/launch/ 3. What is the purpose of the experiment with 10% and 100% sodium? Explain the movement of which ions accounts for the current.
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4. What would occur if you removed 100% of the extracellular Na+? 5. a. Explain what could potentially account for the curve on the lower graph. b. What can be used to block sodium or potassium channels? 6. a. Label what occurs at each step on the action potential graph and fill the blanks for the sodium channels based on the following options: Refractory, Closed, Reset, Open
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- http://www.psych.uiuc.edu/~etaylor4/action_potential.jpg
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Unformatted text preview: b. Define the activation threshold and explain what events are triggered when it is reached. 7. Explain the difference between the relative refractory period and the absolute refractory period. What would happen if there was no absolute refractory period in terms of propagation? 8. For the following properties indicate if it describes an action potential, a graded potential, or applies to both. a. _______ local change, amplitude decreases with distance b. ______ always depolarizing c. _______all or none response to a stimuli d._______ temporal and spatial summation can occur e. _______ propagates without loss f. ________amplitude is always proportional to the stimulus intensity g. ________could either be depolarizing or hyperpolarizing h. _______ information on stimulus intensity is the frequency of the response i. ________has refractory periods j. ________can be generated by voltage-gated ion channels...
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  • Winter '07
  • French
  • 10%, absolute refractory period, Anna Gruzman, [email protected]

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Handout 2 - b Define the activation threshold and explain...

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