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Objective • SWBAT relate organs and tissues in the nervous system to their functions. Functions of the Nervous System • Gathers and interprets information from inside and outside the body • Makes the body respond to that information Two Systems in One Central Nervous System (CNS) • Includes: – Brain – Spinal cord • Gathers information from the PNS • Sends commands to PNS Peripheral Nervous System (PNS) • Includes nerves that extend through body • Gathers information from environment and sends it to brain • Takes commands from the brain to moves muscles Neuron • Nerve cell that transfers (conducts) messages through the body in the form of electrical signals (impulses) Synthetic neurons Nerves • Collection of neurons and tissue bundled together • Connect central nervous system (spinal cord and brain) to all muscles in the body Developing neural tube in a mouse Visual neurons in a male blowfly Check For Understanding A scientist examines this tissue under a microscope. Which statement best identifies a function of this tissue? A. It breaks down and processes food. B. It conducts information through the body. C. It moves oxygen and carbon dioxide. D. It provides structure and support. Spinal Cord • Contains bundles of neurons and tissues • Connects the brain to the peripheral nervous system (all the nerves in your body) The Brain • Main control center of the body • Controls muscle movement: sends electrical signals through nerves to muscles telling them to move Check For Understanding