PEX-03-09 - Correct answer c-70 mV Why is there no response...

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Exercise 3: Neurophysiology of Nerve Impulses: Activity 9: The Action Potential: Putting It All Together Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 12/07/11 page 1
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12/07/11 page 2 Experiment Results Predict Question: Predict Question 1: If you apply a very weak, subthreshold stimulus to the sensory receptor Your answer : a. a small, depolarizing response will occur at R1, and no responses will occur at R2, R3, and R4. Predict Question 2: If you apply a moderate stimulus to the sensory receptor Your answer : b. a small, depolarizing response will occur at R1 and R2, and action potentials will occur at R3 and R4. Predict Question 3: If you apply a strong stimulus to the sensory receptor Your answer : c. action potentials will be generated at all 4 locations Observe the two neurons in the petri dish. What do you think is the resting membrane potential at the receiving end of the sensory neuron (sensory receptor) and the receiving end of the interneuron? Your answer : b. -50 mV
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Unformatted text preview: Correct answer: c. -70 mV Why is there no response at R3 when you apply a very weak stimulus to the sensory receptor? You correctly answered: c. The very weak stimulus does not depolarize the axon of the sensory neuron to threshold. Why is there a larger, depolarizing response at R1 when you apply a moderate intensity stimulus? Your answer : b. The stimulus reduces the passive leak of sodium at R1. Correct answer: c. The stimulus induces a graded receptor potential at R1. Experiment Data: Stimulus Sensory Neuron Membrane Potential (mV) Receptor Sensory Neuron AP Frequency (Hz) in Axon Sensory Neuron Vesicles Released from Axon Terminal Interneuron Membrane Potential (mV) Receiving End Interneuron AP Frequency (Hz) in Axon None -70-70 Weak -60-70 Moderate -40 16.6 4-50 5 Strong -25 33.3 6-40 10 12/07/11 page 3 12/07/11 page 4 Post-lab Quiz Results You have not completed the Post-lab Quiz. 12/07/11 page 5 Review Sheet Results You have not completed the Review Sheet....
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PEX-03-09 - Correct answer c-70 mV Why is there no response...

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