There are more than 40 neurotransmitters in the human nervous system, but some of the most important ones include acetylcholine, norepinephrine, dopamine, gamma-aminobutyric acid (GABA), glutamate, serotonin, and histamine. Here are the 7 major neurotransmitters involved in the brain-body connection:

1. Acetylcholine: This is an excitatory neurotransmitter that plays a role in muscle movement, heart rate, and memory.

2. Norepinephrine: This is both an excitatory and inhibitory neurotransmitter that helps regulate heart rate, blood pressure, and stress response.

3. Dopamine: This is an excitatory neurotransmitter that plays a major role in the brains reward system, motivation, and movement.

4. Gamma-aminobutyric acid (GABA): This is an inhibitory neurotransmitter that helps regulate anxiety, sleep, and muscle tension.

5. Glutamate: This is an excitatory neurotransmitter that helps regulate learning, memory, and synaptic plasticity.

6. Serotonin: This is an inhibitory neurotransmitter that helps regulate mood, appetite, and sleep.

7. Histamine: This is both an excitatory and inhibitory neurotransmitter that helps regulate inflammation, wakefulness, and allergic reactions.

These neurotransmitters allow neurons to communicate with other brain cells and send information throughout the body. They are stored in tiny compartments at the end of neurons called synaptic vesicles and are released into the synaptic cleft to bind to receptor proteins in the cellular membrane of the target tissue.