Definition

A chemical in the body that helps transmit signals in the brain and affects mood, sleep, and other functions.

Example

Low levels of serotonin can lead to feelings of sadness and depression.

Conversation

I read that exercise can boost our serotonin levels.

Really? I didn’t know that!

Yeah, it makes sense since it helps improve our mood.

Totally! I need to get back to the gym then.

Synonyms & Antonyms

Root Explanation

Serotonin is derived from "sero-" (from Latin "serum", meaning serum or fluid) and "tonin" (from Greek "tonos", meaning tension or tone). The word refers to a substance in the blood serum that affects mood and tension in the body.

Memory Tip

Think of 'serum' as a fluid that influences your body's 'tone' or mood — that's how serotonin helps regulate feelings.

Visually Confused Words