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Mr. Gibbons 7R Integrated Science Name_________________________ Date___________________per____ The Nervous System The control center of your body Nervous System: Body system that controls the actions of an animal and sends signals (impulses) to every part of the body System overview: (simplified) Purpose? Coordinates all of the _________________________ which controls EVERY activity done Provides a way to send messages (impulses) to all parts of the body from the brain Stores ________________ and allows for __________________ Maintains ________________________ Reminder: This system functions using a quick STIMULUS RESPONSE method The Organs: The Picture: Central Nervous System (CNS) Brain (A) & Spinal Cord (B) Peripheral Nervous System (PNS) Nerves (C) Note: The average human brain is about 3.0 pounds and contains about 100.0 BILLION neurons (nerve cells) Two parts of the nervous system: Nervous System Central Nervous System: 1. Peripheral Nervous System: Central Nervous System (CNS)Control center of the nervous system controlling both voluntary and involuntary actions Voluntary – Anything you control and think about doing Ex: speaking, running, karate chopping Involuntary – Anything you don’t control and don’t have to think about Ex: digestion, heartbeat, reflexes A. The Brain: Large mass of neurons (nerve cells) located in the head Protected by the: B. Spinal cord: Bundle of nerves in charge of __________________________ Protected by the: 2. Peripheral Nervous System (PNS)All of the ___________________ outside of the central nervous system. The Nervous System Song lyrics by: Mr. Parr Each neuron has a cell body, a nucleus Strands called nerve fibers There are two types them Carrying information out-in When info's channeled to the cell body-Dendrites When it is sent away from-axons They pair up from one cell to a friend To pass on the instructions Chorus: There are millions of nerves They are called neurons And there are just three types Sensory is the first has receptors They respond to stimuli Association's in brain and spinal cord Interpreting the info and passing on To move the motor neurons carry to the body Bring it to the glands Bring it to the muscles...oh oh oh oh oh Nervous System Spinal cord, brain, and nerves... oh oh oh oh oh The Nervous System Nerves are chords that come in packs Of nerve fibers Sensory, motor, or mixed nerves The spinal chord's a thick bundle runs from the brain Through holes in the backbone Info travels through electric signals nerve impulse Neurotransmitter's released at the junction If enough of the chemical builds up In the next neuron Impulse is sent on Chorus: There are two main types of actions, actions Carried out your body, body Voluntary actions, actions Consciously in your mind, mind If you do something, something That is automatic, (that is automatic) Involuntary action, (involuntary action) Like digestion, breathing Involuntary Reflex actions are sudden movements Chorus: Everybody in the world, Let me here you sing it like The Nervous System (spoken) Neurons Definition: Other Vocabulary: Impulse – Electrical signal that travels through the nervous system Synapse– The space between neurons. Chemicals must be used to cross the gap . Neuron Parts 1 Dendrites Cell Body Carries impulses _______________ the cell body Core of the cell containing the _________________ Axon “Wire” that carries impulses _______________ the cell body Myelin Sheath Terminal Branches 2 Fat covering the axon which helps to ___________________ Releases chemicals in order to pass on the impulse Chemical that travels over the _________________ 3 4 5 6 The Reflex Arc It’s a no-brainer! Hey, what about me? 1. Sensory organ is stimulated by some stimulus 2. The impulse is sent to the spine to be processed 3. An impulse is sent to muscle starting a response (reaction)