Action Potential and Receptor Olfactory Receptor

Exercise 3: Neurophysiology of Nerve Impulses: Activity 2: Receptor Potential Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. Assuming that the resting potential of a sensory neuron is -70 mV, which of the following represents a depolarization?
You correctly answered: c. a change to -60 mV
2. Which of the following is a sensory modality (type of sense)?
You correctly answered: e. all of the above
3. Which of the following is a sensory stimulus?
You correctly answered: d. all of the above
4. Which of the following is true of the response of a sensory neuron to the appropriate sensory stimulus?
You correctly answered: c. both a and b

010/27/13

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Experiment Results
Predict Question:
Predict Question 1: The adequate stimulus for a Pacinian corpuscle is pressure or vibration on the skin. Which of the following modalities will induce the largest amplitude receptor potential in the Pacinian corpuscle
Your answer : c. moderate-intensity pressure
Predict Question 2: The adequate stimuli for olfactory receptors are chemicals, typically odorant molecules. Which of the following modalities will induce the largest amplitude receptor potential in the olfactory receptor?
Your answer : a. moderate-intensity chemical
Stop & Think Questions:
Why didn't the Pacinian corpuscle respond to high-intensity light?
You correctly answered: b. Light-transducing proteins are not present in the Pacinian corpuscle.
Judging from these results, does light have a smell?
You correctly answered: b. no
Why did the free nerve ending respond to several different modalities?
You correctly answered: c. The sensory end of this nerve is less specialized.
Experiment Data:
Receptor

Modality

Intensity

Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian corpuscle
Pacinian