Hormones are to the endocrine system as __________________ are to the nervous system. A. nerves B. synapses C. neurotransmitters D. action potentials

Hormones are chemical messengers produced by the endocrine system that enable communication between different cells and organs. They are crucial for regulating various body functions, such as growth, metabolism, and reproduction.

Now, we need to find the option that plays a similar role in the nervous system as hormones do in the endocrine system. Let's look at each option: A. Nerves: Nerves are bundles of neuron fibers that transmit electrical signals throughout the body. They form the network of communication in the nervous system, but they are not the actual messengers (as hormones are in the endocrine system). B. Synapses: Synapses are the junctions or gaps between neurons where communication between neurons takes place, but they are not the actual chemical messengers. C. Neurotransmitters: Neurotransmitters are chemicals that transmit signals across synapses, allowing communication between neurons. They are like hormones in the endocrine system but serve the nervous system. D. Action potentials: Action potentials are electrical impulses generated by the neurons that travel along the nerve fibers, but they are not the actual chemical messengers.

Based on our analysis, the correct answer is C. neurotransmitters, as they are the chemical messengers in the nervous system, similar to the role hormones play in the endocrine system.