The correct answer is c) dermatome.
Neurotransmitters are chemical messengers that transmit signals across synapses between neurons and other cells in the body. Acetylcholine, dopamine, and noradrenaline are all well-known neurotransmitters involved in various brain functions and bodily processes. Acetylcholine plays a key role in muscle activation and memory, dopamine is crucial for reward and motivation mechanisms, while noradrenaline is involved in the body’s ‘fight or flight’ response.
On the other hand, a dermatome is not a neurotransmitter; it refers to an area of skin that is mainly supplied by a single spinal nerve root. Therefore, while the first three options are involved in neurotransmission, a dermatome is related to sensory innervation and anatomical division, making it the correct choice as the option that is not a neurotransmitter.