Recording of nerve & muscle potentials by mechanical stimulation at the rear end of an earthworm with Cobra3

螢幕截圖 2016-04-05 14.11.29 螢幕截圖 2016-03-15 10.27.33  螢幕截圖 2016-03-15 10.27.19

Item no.: P4010111

Principle

Earthworms have a median giant nerve fibre, which reacts to stimulation at the front end, and two lateral giant fibres, which can be stimulated at the rear end.  The experiment covers the following topics: the course of a biphasic action potential over time, estimation of the conduction velocity and coding of the stimulant intensity as frequency modulation.

Tasks

  1. Stimulate the earth worm with weak, moderate and strong stimulation.
  2. Observe the course of the biphasic action potential over time.
  3. Estimate the conduction velocity.

What you can learn about

  • Nerve and muscle potentials
  • Mechanical stimulation
  • Biphasic action potential
  • Frequency modulation
  • Median and lateral giant nerve fibres
  • Conduction velocity