1. Which part of the neuron is responsible for receiving signals from other neurons? A) Axon B) Dendrite C) Soma D) Myelin Sheath Answer: B) Dendrite Rationale: Dendrites are the structures on a neuron that receive electrical messages. These are the main 'input' part of the neuron. 2. What is the primary function of the myelin sheath? A) To generate electrical impulses B) To receive chemical signals C) To speed up the transmission of electrical impulses D) To protect the neuron from damage 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 neural impulses. 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 neurotransmitter predominantly involved in the 'fight or flight' response, which is mediated by the sympathetic nervous system. 4. What is the role of the blood-brain barrier? A) To regulate the passage of substances from the bloodstream into the brain B) To produce cerebrospinal fluid C) To initiate the reflex arc D) To serve as a site for synaptic transmission Answer: A) To regulate the passage of substances from the bloodstream into the brain