This PRO lesson describes the hardware and software setup necessary to record action potentials from a dissected earthworm.
To record the action potential of the earthworm nerve and calculate nerve conduction velocity.
To generate a strength/duration plot for the action potential.
Tasks Performed by the Student
After cleaning and anesthetizing the earthworm, student will:
Dissect the earthworm and identify the nerve cord.
Record velocitystimulate the nerve with increasing distances between the electrodes.
Record for strength/durationincrease the amplitude and stimulate until you reach threshold and the action potential fires.
Add event markers throughout the recording.
The software automates the calibration procedure for the student. There are no knobs and dials to confuse the student.
Graph template files ensure consistent setup for subsequent Subjects or repeated trials—plus, you can easily add your own lesson plan to the onscreen journal.
The lesson will also work as part of a group study.
Student Prep & Distance Learning
Click the link(s) below for sample data and/or lesson procedure video(s), BSL PRO Lesson procedures (PDF) for human lessons*, and graph template files (*.gtl) for BSL PRO Lessons. If more than one .gtl is available, download the .gtl with the _suffix to match BSL version and hardware.
This lesson requires a Biopac Student Lab (BSL) System and the following hardware. If your BSL System does not include all hardware items, expand your system by selecting required items below. For more details, review the Lesson: L# BSL Lessons - see the Lab Manual or launch BSL; A# and H# BSL PRO Lessons, click the PDF link above to review full setup, recording, and analysis procedures.
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