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Related Concept Videos

Action Potentials01:41

Action Potentials

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Overview
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Action Potential01:14

Action Potential

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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
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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.
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Action Potential: Phases of Stimulation01:28

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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...
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Propagation of Action Potentials01:23

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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...
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Postsynaptic Potential (PSP)01:32

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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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Patch Clamp Recordings on Intact Dorsal Root Ganglia from Adult Rats
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Receptor potentials and action potentials in Drosera tentacles.

S E Williams1, B G Pickard

  • 1Department of Biology, Washington University, St. Louis, Missouri.

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|February 1, 2014
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Summary
This summary is machine-generated.

Drosera intermedia tentacle stimulation generates electrical signals. Receptor and action potentials correlate with touch or chemical stimuli, leading to tentacle movement.

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Area of Science:

  • Plant electrophysiology
  • Carnivorous plant research
  • Sensory mechanisms in plants

Background:

  • Drosera intermedia tentacles exhibit complex responses to stimuli.
  • Understanding plant sensory mechanisms is crucial for plant biology.

Purpose of the Study:

  • To investigate the electrical signals (receptor and action potentials) generated by Drosera intermedia tentacles upon stimulation.
  • To correlate these electrical signals with the physical movement of the tentacle.

Main Methods:

  • Electrodes were used to record voltage fluctuations from the tentacle mucilage and stalk.
  • Stimulation methods included contact with insects, inert objects, and salt solutions.
  • Action potential frequency and tentacle inflection were measured.

Main Results:

  • Receptor potentials were detected upon stimulation, with associated action potentials whose frequency depended on stimulus magnitude.
  • Action potentials could be recorded along the tentacle stalk and preceded stalk inflection.
  • The apparent amplitude of stalk-recorded action potentials was independent of receptor potential amplitude.

Conclusions:

  • Electrical signaling, involving receptor and action potentials, is a key component of Drosera intermedia's response to stimuli.
  • The observed electrical activity directly correlates with tentacle movement, suggesting a mechanism for stimulus perception and response.