1. Which part of the neuron is responsible for receiving signals? A. Axon B. Dendrites C. Soma D. Myelin Sheath Answer: B. Dendrites Rationale: Dendrites are the structures on a neuron that receive electrical messages. These messages are then transmitted to the cell body, or soma. 2. What is the primary function of the myelin sheath? A. To generate electrical impulses B. To protect the neuron C. To speed up the transmission of electrical impulses D. To connect neurons together Answer: C. To speed up the transmission of electrical impulses Rationale: The myelin sheath is a fatty layer that covers the axon of some neurons and helps speed up the transmission of electrical signals along the axon. 3. Which neurotransmitter is primarily involved in the sympathetic nervous system response? A. Acetylcholine B. Dopamine C. Norepinephrine D. Serotonin Answer: C. Norepinephrine Rationale: Norepinephrine is the main neurotransmitter used by the sympathetic nervous system, which is responsible for the body's 'fight or flight' response. 4. What is the role of the blood-brain barrier? A. To regulate blood pressure within the brain B. To protect the brain from foreign substances C. To facilitate the entry of nutrients into the brain D. To produce cerebrospinal fluid Answer: B. To protect the brain from foreign substances Rationale: The blood-brain barrier is a selective barrier that prevents many substances from entering the brain, thus protecting it from