Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
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.