What are Neurotransmitters and their Functions?

Neurotransmitters are chemical messengers in the brain that communicate messages between cells, enabling us to think and feel emotions. While we may not always be aware of them, they are at work constantly helping our brains process information and control how we respond to stimuli. In this article, we’ll explore more about Neurotransmitters and their Functions, including the effects of deficiencies.

What are Neurotransmitters?



Neurotransmitters are the molecules and chemical messengers that carry signals between neurons (nerve cells) in the nervous system. 

They are responsible for communication between cells, and play a role in regulating mood, memory, and other cognitive functions.

They also control other necessary functions, including muscle movements and breathing.

Neurotransmitters are released from the ends of nerve cells and travel across a synapse (the gap between the nerve cells) and bind to receptors on other nerve cells, telling them to either fire or not fire a message.

There are many different types of neurotransmitters, each with its own specific function. For example, some neurotransmitters regulate mood, while others play a role in memory, learning, and muscle movement.
Some of the most common include serotonin, dopamine, epinephrine, norepinephrine, endorphins, and glutamate.
All neurotransmitters are important for normal brain function, and imbalances can lead to serious mental health conditions like depression and anxiety. Luckily, there are treatments available that can help correct these imbalances and improve symptoms.
Certain foods can also help balance your neurotransmitters.

Types of Neurotransmitters

According to scientists, there are over 100 neurotransmitters, but let’s look at the most common and the most beneficial ones.

With that in mind, all neurotransmitters are classified according to their different actions. They include:

Excitatory neurotransmitters

Excitatory neurotransmitters are those that excite the neurons, causing them to fire off a message. In other words, they allow for the continued transmission of a chemical message to the next cell.

Examples of excitatory neurotransmitters include epinephrine, norepinephrine, and glutamate.

Excitatory neurotransmitters are important for normal brain function. They allow us to think, feel, and move. Without them, our brains would be much less active.

However, too much excitatory neurotransmitter activity can also be harmful. When there is too much stimulation, neurons can become overexcited and start firing uncontrollably. This can lead to problems like anxiety, seizures, and even brain damage.

Fortunately, the b3rain has ways to regulate excitatory neurotransmitter activity. There are inhibitory neurotransmitters that help keep cell activity in check. And when excitatory neurotransmitter levels get too high, the brain can release chemicals that cause neurons to stop firing altogether.

Inhibitory neurotransmitters

These ones inhibit a chemical message from being conveyed along any further.

It thus reduces the activity of neurons and prevents them from firing excessively. This helps keep the nervous system functioning properly and prevents it from becoming overstimulated.

Inhibitory neurotransmitters are essential for maintaining a healthy balance in the nervous system. Without them, neurons would fire indiscriminately, leading to chaos and dysfunction. These chemicals help to keep the nervous system operating smoothly and efficiently by keeping neuron activity under control.

Deficits in inhibitory neurotransmission have been linked to several neurological disorders, such as epilepsy, Parkinson’s disease, Alzheimer’s disease, schizophrenia, and autism spectrum disorder. 

Modulatory neurotransmitters

Modulatory neurotransmitters are chemicals that modify the effects of other neurotransmitters. They can either potentiate (increase) or inhibit (decrease) the activity of other neurotransmitters. Modulatory neurotransmitters are important because they help to fine-tune neuronal activity and communication.

Neurotransmitter Classification

Neurotransmitters can further be classified depending on their chemical nature

Common categories include:

a. Monoamine neurotransmitters

Monoamine neurotransmitters are a class of chemical messenger molecules that contain one amino acid.

These neurotransmitters are involved in mood, emotion, cognition, attention, and consciousness. 

Common conditions of the nervous system involve an abnormality in these neurotransmitters. 

Most drugs that people take also affect these neurotransmitters.

They include:


Serotonin is a neurotransmitter that plays a role in mood, social behavior, appetite, digestion, sleep, pain, memory, and sexual desire. It is derived from the amino acid tryptophan, and is found in many foods, including oats, pumpkin seeds, and sesame seeds.

Serotonin is also produced in the gut (90%) and the brain(10%).

Most people know of serotonin as the “happy chemical” because it’s linked to feelings of well-being and happiness. On the contrary, low serotonin levels are associated with depression, anxiety, chronic pain, and fibromyalgia.


Dopamine is a neurotransmitter that plays a major role in the brain’s reward system. It is involved in the reinforcement of pleasurable activities and the formation of habits.

Dopamine is released when we experience something pleasurable, such as eating good food, using certain drugs, or receiving a reward. This dopamine release reinforces the behavior that led to the pleasure, making us more likely to repeat it.

While dopamine is best known for its role in the brain’s reward system, it also has other important functions. 

For example, dopamine is involved in movement, motivation, and attention. It also plays a role in learning and memory. Dopamine deficiency can lead to conditions such as Parkinson’s disease and ADHD.


Norepinephrine (also known as noradrenaline) is a hormone and neurotransmitter that plays an important role in the sympathetic nervous system.

In times of stress, norepinephrine is released into the bloodstream and acts on the adrenergic receptors to increase heart rate and blood pressure. This “fight-or-flight” response provides the body with the energy it needs to deal with a stressful situation.

Norepinephrine also has powerful effects on the brain, influencing mood, alertness, arousal, attention, and focus.


Epinephrine, also known as adrenaline, is another hormone and neurotransmitter that plays a key role in the fight-or-flight response. 

Like norepinephrine, when the body experiences stress, epinephrine is released into the bloodstream, which increases heart rate, blood pressure, and sugar metabolism. 

In addition to its physiological effects, adrenalin also has powerful psychological effects. It can increase alertness and energy levels, as well as reduce fear and anxiety. 

Adrenaline is also a common medication to treat various conditions such as asthma, anaphylaxis, severe infections, and cardiac arrest. 

That being said, high levels of epinephrine can lead to an irregular heartbeat, increased blood pressure, anxiety, and even heart attack. Epinephrine is also a vasoconstrictor, meaning that it can constrict blood vessels and reduce blood flow. This can lead to serious problems such as stroke or organ damage.


Histamine is a monoamine neurotransmitter involved in the immune response as well as regulating the sleep-wake cycle. It is produced by the body in response to an allergy or injury and acts on H1 receptors to cause vasodilation and increased permeability of the blood vessels. 

This leads to the characteristic symptoms of an allergic reaction, such as swelling and itchiness. In the brain, histamine is involved in wakefulness and has been shown to modulate memory and learning.

b. Amino acids neurotransmitters

Amino acids neurotransmitters are amino acids that are able to pass a message across a synapse.

They include:


Glutamate is an amino acid that acts as an excitatory neurotransmitter in the brain. It’s the most abundant neurotransmitter in the brain and plays an important role in thinking, learning, and memory.

When we learn something new, our brains create new connections between neurons. These new connections are made possible by increased levels of glutamate in the brain.

Glutamate also plays a role in many neurological disorders, such as Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, and amyotrophic lateral sclerosis (ALS). In these diseases, there is an imbalance of glutamate transmission, which can lead to cell death.


Glycine is an inhibitory neurotransmitter, meaning that it blocks nerve impulses. This makes it an important neurochemical for regulating the body’s nervous system. 

Glycine is found in high concentrations in the brain and spinal cord, where it helps to keep the nervous system functioning properly. It is also found in smaller amounts in other body parts, including the gut, muscles, and skin.

Glycine plays a role in a number of different bodily functions, including digestion, muscle movement, and sleep. It is also involved in learning and memory. 

In the brain, glycine helps to protect neurons from damage and death. This neuroprotective effect is one of the reasons why glycine is being studied as a potential treatment for disorders like Alzheimer’s disease and stroke.

While glycine is an important neurotransmitter with many beneficial effects, too much of it can have negative consequences. High levels of glycine can lead to anxiety, agitation, and even hallucinations. 


Gaba (gamma-aminobutyric acid) is an inhibitory neurotransmitter that helps regulate communication between neurons in the brain.

It is present in high concentrations in the brain and works to regulate the firing of other neurons. When GABA binds to its receptor, it causes a decrease in the neuron’s excitability. This can have calming effects on the brain and body. GABA is involved in many processes, including anxiety, stress, sleep, and seizure control.

c. Peptide neurotransmitters

Peptide neurotransmitters are a class of signaling molecules that are composed of short chains of amino acids. These neurotransmitters are involved in a wide variety of physiological processes, including memory, emotion, and pain perception.

Peptides are released from neurons in response to various stimuli and bind to specific receptors on target cells to produce their effects. While many peptides function as hormones in the body, some also act as neurotransmitters within the brain.


Endorphins are a type of neurotransmitter that is released in response to pain or stress. They are part of the body’s natural pain-relieving mechanisms and can provide a sense of euphoria. 

E are produced by the pituitary gland and the hypothalamus in response to pain or stress. They are released into the bloodstream and travel to the brain, where they bind to opioid receptors. This binding produces a feeling of euphoria.

Endorphins have a variety of effects on the body, including reducing pain perception, regulating mood and emotions, and influencing social behavior. For example, endorphins have been shown to reduce anxiety and depression, improve sleep quality, and increase pain tolerance.

In addition to their role in pain relief, endorphins also play a role in exercise-induced euphoria. This phenomenon, known as “runner’s high,” is characterized by a sense of well-being and increased energy levels. It is thought that endorphins contribute to this feeling by reducing stress levels and improving mood.


Acetylcholine is a type of excitatory chemical messenger or neurotransmitter that plays a vital role in the central and peripheral nervous system. It is involved in a variety of functions, including muscle contraction, heart rate, and memory.

Acetylcholine binds to receptors on target cells and activates them. This leads to a change in the cell’s activity, which then produces a specific response.

The effects of acetylcholine depend on the type of receptor it binds to. For example, binding to receptors in the heart can increase heart rate, while binding to receptors in muscles can cause them to contract.

Acetylcholine is important for many different processes in the body. In the brain, it is involved in learning and memory. It also plays a role in regulating mood and sleep. In the periphery, it helps with contraction of skeletal muscles and regulates heart rate.

If there is an imbalance of acetylcholine in the body, it can lead to problems with movement, learning, and memory. Too much or too little acetylcholine can both have negative effects. Acetylcholine levels are regulated by enzymes that break it down when levels get too high.

Final Thoughts

Neurotransmitters are responsible for transmitting electrical signals throughout the brain and body, allowing us to think, feel, and respond.

The understanding of neurotransmitters has given us insight into many psychological disorders such as depression and anxiety. It is important to note that there are many different types of neurotransmitters in the body with each playing a vital role in maintaining health.

Neurotransmitters could even potentially lead to new treatments for neurological diseases and disorders. While much research still needs to be done in this field, it’s clear that neurotransmitters play an important role in health and well-being. With continued exploration, we may one day be able to unlock their full potential.

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