Which Substance Is a Hormone That Acts Primarily on Cells

question 32

Multiple Choice

Which substance is a hormone that acts primarily on cells close to the source of the hormone?

• A) Adrenaline
• B) Estrogen
• C) Histamine
• D) Insulin
• E) Thyroxine

---

Definitions:

Neurotransmitters

Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.

Dopamine

A neurotransmitter involved in the regulation of mood, pleasure, movement, and the reward system in the brain.

Serotonin

A neurotransmitter that plays an important role in mood regulation, as well as sleep, appetite, and digestion.

Depression

A psychiatric condition defined by a sustained low mood or apathy towards activities, significantly hindering daily operations.