5. Which of the following is the BEST definition of a neurotransmitter?
The source of emotions first identified by the ancient Egyptians.
A cell that transmits electrical and chemical signals throughout the brain.
The main part of the brain responsible for processing emotions.
A chemical that allows neurons to communicate with each other.



Answer :

Final answer:

Neurotransmitters are essential chemicals for communication in the nervous system, regulating various bodily functions.


Explanation:

Neurotransmitter is a chemical message that relays signals between neurons, enabling communication between cells in the nervous system. These endogenous chemicals are released at synapses and play a crucial role in regulating various functions in the body, including emotions, cognition, and movement. Over 100 neurotransmitters have been identified, each with specific functions and effects.


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