The term "number" refers to the quantity or amount of something. In relation to neurotransmitters, it refers to the understanding of how many different types of neurotransmitters are present in humans.
Related terms
Diversity: This term refers to the variety or range of different types of neurotransmitters present in humans.
Classification: It involves categorizing or grouping neurotransmitters based on their chemical structures and functions.
Quantification: This term relates to measuring or determining the exact amounts or concentrations of specific neurotransmitters in the brain.