Ohio State Board Nail Technician Practice Exam

The three main types of the nervous system are the central nervous system, peripheral nervous system, and autonomic nervous system. The central nervous system is responsible for processing and coordinating information, while the peripheral nervous system connects the central nervous system to the rest of the body. The autonomic nervous system controls involuntary actions such as heart rate and digestion. Options A and D are incorrect because they do not cover all three types of the nervous system. Option C is incorrect because somatic and visceral refer to types of nerves within the nervous system, not main types. Option B is the correct answer as it includes the three main types of the nervous system.