PhysioEx Lab Report
Exercise 3: Neurophysiology of Nerve Impulses Activity 2: Receptor Potential Name: Sara Ross Date: 3 February 2023
Session ID: session-ce95a38e-95bf-0aa2-c8e4-dc969fb105ed
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: 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?
You correctly answered: 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.
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 Potential (mV)
Peak Value of|Amplitude of Response Response (mV) (mV)
Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle
---
---
-70
-70
0
Pressure
Low
-70
-60
10
Pressure
Moderate
-70
-45
25
Pressure
High
-70
-30
40
Chemical
Low
-70
-70
0
Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle
Chemical
Moderate
-70
-70
0
Chemical
High
-70
-70
0
Heat
Low
-70
-70
0
Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle Pacinian corpuscle
Heat
Moderate
-70
-70
0
Heat
High
-70
-70
0
Light
Low
-70
-70
0
Light
Moderate
-70
-70
0
Pacinian corpuscle
Light
High
-70
-70
0
Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor Olfactory receptor
-70
-70
0
Pressure
Low
-70
-70
0
Pressure
Moderate
-70
-70
0
Pressure
High
-70
-70
0
Chemical
Low
-70
-64
6
Chemical
Moderate
-70
-58
12
Chemical
High
-70
-45
25
Heat
Low
-70
-70
0
Heat
Moderate
-70
-70
0
Heat
High
-70
-70
0
Light
Low
-70
-70
0
Light
Moderate
-70
-70
0
Light
High
-70
-70
0
Free nerve ending Free nerve ending Free nerve ending Free nerve ending Free nerve ending Free nerve ending Free nerve ending Free nerve ending
-70
-70
0
---
Pressure
Low
-70
-70
0
Pressure
Moderate
-70
-70