A neurotransmitter which also functions as hormone is

Options

A. Acetylcholine
B. Dopamine
C. Noradrenaline/Norepinephrine
D. Both B and C.

Answer

To answer the question "A neurotransmitter which also functions as a hormone is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Neurotransmitters**: These are chemical messengers that transmit signals across synapses (the junctions between nerve cells). They are produced by nerve cells in response to electrical impulses and act on target cells such as other neurons, muscle cells, or gland cells.
- **Hormones**: These are also chemical messengers but are secreted by endocrine glands and travel through the bloodstream to regulate various bodily functions, including the activity of organs, tissues, and cells.

2. **Analyze the Options**:
- **Option 1: Acetylcholine**: This is primarily a neurotransmitter that plays a role in muscle activation and does not function as a hormone. Therefore, this option is incorrect.
- **Option 2: Dopamine**: This is known as a "feel-good" neurotransmitter and also functions as a hormone. It is involved in pleasure, reward, and various bodily functions. This option is correct.
- **Option 3: Noradrenaline (Norepinephrine)**: This neurotransmitter is released during stress and also acts as a hormone, affecting blood pressure and heart rate. This option is also correct.
- **Option 4: Both B and C**: Since both dopamine and norepinephrine function as neurotransmitters and hormones, this option is correct.

3. **Conclusion**:
- The correct answer is **Option 4: Both B and C**, which includes dopamine and norepinephrine as neurotransmitters that also function as hormones.

### Final Answer:
**Both B and C (Dopamine and Norepinephrine)** are neurotransmitters that also function as hormones.

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