Nerves and Muscles

Electrocardiography

Why do we find a cellar warm in winter but pleasantly coolin summer?

Electromyography

We investigate our muscular power - electromyography

Principle

With the exception of the heart muscle, the contractions of striated muscles can be controlled at will. This characteristic enables the observation of the activities of individual muscle groups. An electromyogram (EMG) can be used to measure (record) ...

Electrooculography

Neurosimulator (mode of operation of excitatory synapses)

Mechanical stimulation at the front end of earthworm

Electrical stimulation of an anaesthetised earthworm

Muscle stretch reflex and determination of the conductingvelocity

Ionic permeability of the cell membrane

Principle

The cell membrane controls the transport of nutrients and water into the cell as well as the transport of waste products and water out of the cell. This can be passive, i.e. caused by osmotic processes, as well as active. The aim of this experiment is ...

Recording of nerve and muscle potentials by mechanical stimulation at the rear end of an earthworm (Cobra3)

Principle and tasks

To work on the following themes by measuring nerve and muscle potentials:

• the course of a biphasic action potential over time
• estimation of the conduction velocity
• coding of the stimulant intensity as frequency modulation ...

Recording of nerve and muscle potentials by mechanical stimulation at the front end of an earthworm (Cobra3)

Principle and tasks

To work on the following themes by measuring nerve and muscle potentials:

• The difference in sensitivity of the front and rear ends
• The facilitation effect
• Conduction velocity and fibre diameter
• Synaptic depress ...

Recording of nerve potentials after the electrical stimulation of an anaesthetised earthworm (with the Cobra3 Basic-Unit

Principle and tasks

To work on the following themes by measuring nerve and muscle potentials:

• The action of an anaesthetic
• The different conduction velocities of median and lateral giant fibres
• Refractory period of the median giant fibre

Model experiment illustrating the development of resting potential (with Cobra4)

Principle and tasks

The potential difference between two electrolyte concentrations separated by a membrane (cellophane or cation permeable) is detected by two silver chloride electrodes and measured with a mV meter. The measured and calculated values are compared.

Neurosimulator: membrane time constant and low-pass filte-ring (with the Cobra3 Basic-Unit)

Principle and tasks:

To use a nerve function model to work onthe following themes:

• The time constant of the nerve membrane and intracellular potential
• The low-pass characteristic of the nerve membrane

What you can le ...