Beatrice Lang
Neurons are essentially electrical devices, using electrical signals for internal communication and chemical signals for interactions with other neurons. This enables complex networks that underlie all nervous system functions. For example, when you touch something hot, sensory neurons send an electrical signal to your brain, which is an internal communication. Once the signal reaches the brain, neurotransmitters are released to convey that information to other neurons, enabling a rapid response to pull your hand away.
| Characteristics | Values |
|---|---|
| Communication within neurons | Electrical |
| Communication between neurons | Chemical |
| Basis of electrical signal within a neuron | Action potential |
| Occurrence of action potential | When neuron's membrane potential reaches -50 mV |
| Action potential reference | Spike |
| Occurrence of chemical communication between neurons | At synapses |
| Types of synapses | Electrical and chemical |
| Function of synapses | Convert electrical signals to chemical signals and vice versa |
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What You'll Learn
Communication within a neuron is electrical
Neurons are essentially electrical devices. Communication within a neuron is electrical, while communication between neurons is chemical. Neurons communicate with each other via electrical events called 'action potentials' and chemical neurotransmitters.
Action potentials are the fundamental units of communication between neurons and occur when the sum total of all the excitatory and inhibitory inputs makes the neuron's membrane potential reach around -50 mV. This is called the action potential threshold. Neuroscientists often refer to action potentials as ''spikes' and say that a neuron has 'fired a spike' or 'spiked'. This refers to the shape of an action potential as recorded using sensitive electrical equipment.
The electrical changes taking place within a neuron are similar to a light switch being turned on. A stimulus starts the depolarization (hand on the switch), but the action potential runs on its own once a threshold has been reached (electricity moving through the wires to the light). Temporary changes to a neuron's cell membrane voltage can result from stimuli in the environment or from the action of one neuron on another. These temporary changes in membrane potential influence a neuron and determine whether an action potential will occur or not.
The basis of the electrical signal within a neuron is the action potential that propagates down the axon. For a neuron to generate an action potential, it needs to receive input from another source, either another neuron or a sensory stimulus. That input will result in opening ion channels in the neuron, resulting in a graded potential based on the strength of the stimulus. Graded potentials can be depolarizing or hyperpolarizing and can sum up to affect the probability of the neuron reaching the threshold at the initial segment or trigger zone.
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Communication between neurons is chemical
When an electrical signal, known as an action potential, reaches the synapse, it causes the release of chemical neurotransmitters from neuron A into the synaptic cleft, a small gap between the neurons. These neurotransmitters include amino acids such as glutamate, glycine, and gamma-aminobutyric acid (GABA). The neurotransmitters then bind to receptors on the postsynaptic side of neuron B. This binding opens ion channels, allowing positive or negative ions to flow into or out of neuron B, converting the chemical signal back into an electrical signal.
The type of neurotransmitter released determines the effect on the postsynaptic neuron. Neurotransmitters can either excite or inhibit the postsynaptic neuron, influencing whether it will fire its own action potential. This process is essential for the complex networks that underlie all nervous system functions.
For example, when you touch something hot, sensory neurons send an electrical signal to your brain. Once the signal reaches the brain, neurotransmitters are released to convey that information to other neurons, enabling a rapid response, such as pulling your hand away.
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Action potentials are the fundamental units of communication between neurons
Neurons are essentially electrical devices that communicate with each other through electrical events called "action potentials" and chemical neurotransmitters. Action potentials are the fundamental units of communication between neurons. They occur when the sum total of all the excitatory and inhibitory inputs makes the neuron's membrane potential reach around -50 mV, a value called the action potential threshold.
Action potentials are brief (around 1 ms) electrical events that are typically generated in the axon, which is the transmitting part of the neuron. The axon is a long, thin structure that is insulated by a myelin sheath. Action potentials signal the neuron as "active" and allow the neuron to communicate with other neurons. They are generated by special types of voltage-gated ion channels embedded in a cell's plasma membrane. When a stimulus causes a change in the membrane potential to the values of the threshold potential, ion channels open, and the ions decrease their concentration gradients.
When an action potential reaches the presynaptic terminal, it causes a neurotransmitter to be released from the neuron into the synaptic cleft, a 20-40 nm gap between the presynaptic axon terminal and the postsynaptic dendrite. The neurotransmitter can either excite or inhibit the target neuron, helping or hindering it from firing its own action potential. Synapses can be thought of as converting an electrical signal (the action potential) into a chemical signal in the form of neurotransmitter release.
In an electrical synapse, the membranes of two cells directly connect through a gap junction, allowing ions to pass directly from one cell to the next, transmitting a signal. In a chemical synapse, a neurotransmitter is released from the neuron and binds to a receptor on the other cell.
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Synapses are the contacts between neurons
Communication within neurons is electrical, while communication between neurons is chemical. This chemical communication occurs at synapses, which are the points of contact between neurons. Synapses are highly specialized cellular structures that mediate communication between neurons or between neurons and other cells.
There are two types of synapses: chemical synapses and electrical synapses. In a chemical synapse, a chemical signal—a neurotransmitter—is released from the neuron and binds to a receptor on another cell. The neurotransmitter can either excite or inhibit the receiving neuron from firing its own action potential. Chemical synapses can be identified by certain characteristics, such as the use of neurotransmitters to relay signals and the presence of vesicles that store and transport these neurotransmitters.
In contrast, electrical synapses involve the direct passage of electrical current or signals from one neuron to another through gap junctions. In these cases, ions pass directly from one cell to the next, transmitting a signal. Electrical synapses are less common than chemical synapses, especially in mammals.
The synapse is the fundamental unit of neuronal communication, and it plays a crucial role in the functioning of the nervous system. The transmission of signals from the pre-synaptic to the post-synaptic neuron occurs at the synapse, and the specific characteristics of a synapse can vary depending on the neurotransmitter system produced by the neuron.
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Synapses can be chemical or electrical
Neurons communicate with each other via electrical events called "action potentials" and chemical neurotransmitters. At the junction between two neurons, known as the synapse, an action potential causes neuron A to release a chemical neurotransmitter. This neurotransmitter can either excite or inhibit neuron B from firing its own action potential.
Synapses are the contacts between neurons, which can be either chemical or electrical in nature. In a chemical synapse, a neurotransmitter is released from the neuron and binds to a receptor on another cell. The neurotransmitter can diffuse across the synaptic cleft and bind to ligand-gated ion channels in the postsynaptic membrane, resulting in a localized depolarization or hyperpolarization of the postsynaptic neuron. Chemical synapses are the more common type.
In an electrical synapse, the membranes of two cells are directly connected through a gap junction, allowing ions and other molecules to pass directly from one cell to the next. Electrical synapses are less common than chemical synapses but are found in all nervous systems and play important and unique roles. They are often found in sensory systems like the retina and in non-neural tissues like the liver and heart.
The process of converting electrical signals to chemical signals and vice versa requires subtle changes that can result in transient increases or decreases in membrane voltage. This conversion process is essential for neurons to communicate effectively and respond to stimuli.
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Frequently asked questions
Communication within neurons is electrical.
The electrical signals within neurons are called action potentials or spikes.
Neurons communicate with each other through a combination of electrical and chemical signals. At the junction between two neurons, known as the synapse, an action potential causes the release of chemical neurotransmitters. These neurotransmitters can excite or inhibit the receiving neuron from firing its own action potential.
Examples of neurotransmitters include glutamate, glycine, and gamma-aminobutyric acid (GABA). Neurotransmitters can be derived from amino acids or formed through other processes, such as enzymatic changes or covalent bonding.
