Bio 226 Action Potentials Lab Report

Laboratory Report



LABORATORY REPORT
Activity: Action Potentials
Name: Nadiyah Pate
Instructor: Vikash Patel
Date: 10.29.2021

Predictions
1. Exceeding threshold depolarization at the trigger zone______the likelihood of generation of an action potential.
decreases


2. Action potential amplitude
does not change with distance


3. Increasing frequency of stimulation to the trigger zone
does not change number of action potentials.



Materials and Methods
Experiment 1: Effect of Stimulus Strength on Action Potential Generation
1. Dependent Variable
membrane potential


2. Independent Variable
stimulus strength (voltage)


3. Controlled Variables
frequency of stimulation, type of neuron



Experiment 2: Effect of Frequency of Stimulation on Action Potential Generation
1. Dependent Variable
membrane potential


2. Independent Variable
frequency of stimulation


3. Controlled Variables
stimulus strength (voltage), type of neuron



4. Which part of the neuron was stimulated?
The dendrite of the neuron was stimulated.


5. Where was membrane potential measured?
Membrane potential was measured at the axon hillock and the axon of the neuron, known as the "trigger zone."


6. What was used to measure membrane potential?
A voltmeter was used to measure membrane potential.



Results
Table 3: Change in Membrane Potential From Axon Hillock to Axon
a. Values of maximal depolarization of membrane potential (mV) at different stimulation voltages, by location.




Laboratory Report/ Nadiyah Pate/ Action Potentials/ Vikash Patel/ 10.29.2021/ Page [1] of [4]