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Download Nervous System (Day 13).
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Nervous System Function of the Nervous System • Carries messages within the body • Allows us to respond to our environment • Consists of central nervous system (brain and spinal cord) and peripheral nervous system (nerves) You’ve got a lot of nerve! • 3 types: – Control voluntary muscles (flex!) – Carry info from sensory organs (eyes, nose, ears, etc.) – Regulate involuntary functions (breathing, heartbeat, digestion) Nerve Tissue • • • • • • Made up of specialized cells (neurons) Approx 100 billion in brain One of few cells that are never replaced Communication specialists Allow 2-way flow (to and from brain) Conduct electrical signals What makes “You” Different? • TMI moment of the day: Study of the Teenage Brain! • http://videos.howstuffworks.com/tlc/29323tlc-a-study-of-the-teenage-brain-video.htm 6 Sensory Receptors • Specialized cells • Receive input from environment • Send signals to CNS (brain) • Respond to heat, pressure, light, pain, fear, etc. • Different parts of brain involved Brain Areas New Technology • “Bionic” arm • Artificial arm controlled by nerves • Amputees • Re-route arm nerves to other parts • Can move prosthetic arm by thinking about it: Check this out! http://www.youtube.com/watch?v= T6R5bm6qx2E Homework • Read pages 104-106 Questions on Page 107 # 2,4-7 • Work on Disease Project (due Wednesday November 4th)
