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Action Potentials

Action Potentials

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...

Action Potential: Phases of Stimulation

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...

Generation of Action Potential in Skeletal Muscles

Generation of Action Potential in Skeletal Muscles

Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...

Propagation of Action Potentials

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

Cardiac Action Potential

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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Related Experiment Video

Updated: Jul 24, 2025

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels

Published on: February 14, 2018

Demystifying the Venus flytrap action potential.

Rainer Hedrich¹, Ines Kreuzer¹

¹Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany.

The New Phytologist

|July 10, 2023

Summary

This summary is machine-generated.

The Venus flytrap generates rapid electrical signals (action potentials) to capture prey. Its unique ion channels and pumps enable this carnivorous plant

Keywords:

action potential calcium signalling carnivorous plant hunting cycle ion transporter

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Last Updated: Jul 24, 2025

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels

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Published on: February 14, 2018

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Published on: June 13, 2017

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Published on: October 15, 2012

Area of Science:

Plant electrophysiology
Carnivorous plant biology
Molecular mechanisms of action potentials

Background:

Plants exhibit electrical excitability, but few produce distinct action potentials (APs).
The Venus flytrap (Dionaea muscipula) is known for its rapid APs, crucial for prey capture.
APs in Dionaea are integral to its hunting cycle, with the number of APs influencing capture decisions.

Purpose of the Study:

To investigate the electrophysiological properties of the Venus flytrap's action potential.
To understand the molecular basis of the rapid and high-frequency APs in Dionaea.
To elucidate the ion channels, pumps, and carriers responsible for each phase of the Venus flytrap AP.

Main Methods:

Electrophysiological recordings to characterize action potentials.
Analysis of ion channel, pump, and carrier expression during plant maturation and excitability.
Investigating the role of specific molecular components in AP generation and propagation.

Main Results:

Dionaea muscipula exhibits action potentials with high frequency and speed, facilitating rapid prey capture.
The archetypal AP in Dionaea lasts 1 second and comprises five distinct phases: resting state, Ca2+ transient, depolarization, repolarization, and hyperpolarization.
A specific set of ion channels, pumps, and carriers is expressed as the plant matures, with each component regulating a distinct phase of the AP.

Conclusions:

The Venus flytrap's unique electrophysiology is key to its carnivorous function.
Understanding the molecular players in Dionaea's APs provides insights into plant electrical signaling.
This study highlights the sophisticated ion transport mechanisms underlying rapid electrical signaling in plants.