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Action Potential

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...

Action Potential

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...

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Spinal Nerves: Anatomy

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There are 31 bilateral pairs of spinal nerves, each emerging from the spinal cord through the intervertebral foramina—openings between adjacent vertebrae. These nerves are...

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The spinal cord, a critical component of the central nervous system, extends from the base of the brainstem to the lumbar region of the vertebral column. It is essential for maintaining physical stability and facilitating communication between the brain and peripheral parts of the body.

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Spinal Cord: Information Processing

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The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
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Related Experiment Video

Updated: Jun 19, 2026

Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises

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Published on: January 18, 2011

THE RATE OF TRANSMISSION IN THE NERVE NET OF THE COELENTERATES.

¹Contributions from the Zoölogical Laboratory of the Museum of Comparative Zoölogy, Harvard College, Cambridge, No. 313.

The Journal of General Physiology

|October 30, 2009

Summary

Nerve net transmission in Metridium, a type of sea anemone, was measured at 21 degrees C. Speeds ranged from 121 to 146 mm/sec, indicating variable signal propagation.

Area of Science:

Marine Biology
Neuroscience
Invertebrate Zoology

Background:

The nerve net system facilitates basic physiological functions in cnidarians.
Understanding nerve transmission is crucial for cnidarian behavior and ecology.

Purpose of the Study:

To quantify the speed of nerve net transmission in Metridium.
To establish baseline physiological data for Metridium at a specific temperature.

Main Methods:

Electrophysiological recordings were used to measure nerve impulse propagation.
Experiments were conducted on Metridium specimens at a controlled temperature of 21 degrees C.

Main Results:

Nerve net transmission speeds in Metridium were found to vary between 121 mm/sec and 146 mm/sec.

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This demonstrates a range of conduction velocities within the organism's nerve net.

Conclusions:

The study provides quantitative data on nerve net conduction velocity in Metridium.
These findings contribute to the understanding of signal processing in simple nervous systems.