Biology 30 – Nervous System Practice Exam

The main idea here is how signaling speed and precision differ between the nervous system and the endocrine system. The nervous system uses rapid electrical impulses that travel along neurons, with neurotransmitters released at synapses to produce effects on specific muscles or glands. These responses are fast and typically short-lived, and they act very precisely on targeted effectors. That contrasts with the endocrine system, which releases hormones into the bloodstream; these hormones can reach many tissues, generally taking longer to produce effects and often lasting longer, though they can still be specific when receptors are present. The statement that nervous signals are fast and short-lived with precise effects on specific muscles or glands best captures this contrast. The other ideas mischaracterize the systems: nervous signaling isn’t slow and hormone-based, endocrine signals aren’t limited to the brain, and the speeds of signaling aren’t the same in the two systems.