Experiment Results
Predict Question:
Predict Question 1: If you apply a very weak, subthreshold stimulus to the sensory receptor
Your answer : c. action potentials will be generated at all four locations.
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 : a. a large, depolarizing response will occur at R1 and R3, and action potentials will occur at R2 and R4.
Stop & Think Questions:
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?
You correctly answered: 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?
You correctly answered: c. The stimulus induces a graded receptor potential at R1.
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