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Exercise 3: Neurophysiology of Nerve Impulses Activity 2: Receptor Potential
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PhysioEx Exercise 3 Activity 2 Exercise 3: Neurophysiology of Nerve Impulses Activity 2: Receptor Potential
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26-5-2021 PhysioEx Exercise 3 Activity 2PhysioEx Lab Report
Exercise 3: Neurophysiology of Nerve Impulses
Activity 2: Receptor Potential
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 75% by answering 3 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: a change to -60 mV.
2 Which of the following is a sensory modality (type of sense)?
You correctly answered: all of the above.
3 Which of the following is a sensory stimulus?
You correctly answered: all of the above.
4 Which of the following is true of the response of a sensory neuron to the appropriate sensory
stimulus?
Your answer: It can be called a receptor potential, and it is a graded potential.
Correct answer: Both of the above.
Experiment Results
Predict Questions
1 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: moderate-intensity pressure.
2 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: moderate-intensity chemical.
Stop & Think Questions
1 Why didn't the Pacinian corpuscle respond to high-intensity light?
You correctly answered: Light-transducing proteins are not present in the Pacinian corpuscle.
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex3/act2/ 1/6
, 26-5-2021 PhysioEx Exercise 3 Activity 2
2 Judging from these results, does light have a smell?
You correctly answered: No.
3 Why did the free nerve ending respond to several different modalities?
You correctly answered: The sensory end of this nerve is less specialized.
Experiment Data
Receptor Modality Intensity Resting Peak Value of Amplitude of
Potential Response Response
(mV) (mV) (mV)
Pacinian
--- --- -70 -70 0
corpuscle
Pacinian
Pressure Low -70 -60 10
corpuscle
Pacinian
Pressure Moderate -70 -45 25
corpuscle
Pacinian
Pressure High -70 -30 40
corpuscle
Pacinian
Chemical Low -70 -70 0
corpuscle
Pacinian
Chemical Moderate -70 -70 0
corpuscle
Pacinian
Chemical High -70 -70 0
corpuscle
Pacinian
Heat Low -70 -70 0
corpuscle
Pacinian
Heat Moderate -70 -70 0
corpuscle
Pacinian
Heat High -70 -70 0
corpuscle
Pacinian
Light Low -70 -70 0
corpuscle
Pacinian
Light Moderate -70 -70 0
corpuscle
Pacinian
Light High -70 -70 0
corpuscle
Olfactory
--- --- -70 -70 0
receptor
Olfactory
Pressure Low -70 -70 0
receptor
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex3/act2/ 2/6
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