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THE NERVOUS SYSTEM THE NERVOUS SYSTEM • BRAIN • SPINAL CORD • NERVES • SENSE ORGANS FUNCTIONS OF THE NERVOUS SYSTEM • 1. RECEIVING INFORMATION • YOU ARE AWARE OF WHAT IS HAPPENING BOTH INSIDE AND OUTSIDE THE BODY • 2. RESPONDING TO INFORMATION • STIMULUS – ANY CHANGE OR SIGNAL IN THE ENVIRONMENT THAT CAN MAKE AND ORGANISM REACT • RESPONSE – WHAT THE BODY DOES IN REACTION TO A STIMULS • 3. MAINTAINING HOMEOSTASIS • DIRECTS THE BODY TO RESPOND APPROPRIATELY TO THE INFORMATION IT RECEIVES DIVISIONS OF THE NERVOUS SYSTEM • CENTRAL NERVOUS SYSTEM • ALL INFORMATION ABOUT WHAT IS HAPPENING IN THE WORLD INSIDE AND/OR OUTSIDE THE BODY IS BROUGHT TO CENTRAL NERVOUS SYSTEM • CONTROL CENTER OF THE BODY • CONSISTS OF THE BRAIN AND SPINAL CORD DIVISIONS OF THE NERVOUS SYSTEM: CENTRAL NERVOUS SYSTEM • 3 MAIN REGIONS OF BRAIN • • BRAIN • CONTROLS MOST FUNCTIONS • CONTAINS NEURONS APPROX. IN BODY 100 BILLION • • 1. CEREBRUM • INTERPRETS INPUT FROM THE SENSES • CONTROLS MOVEMENT • CARRIES OUT COMPLEX MENTAL PROCESSES 2. CEREBELLUM • COORDINATES THE ACTIONS OF YOUR MUSCLES • HELPS MAINTAIN BALANCE 3. BRAIN STEM • CONTROLS THE BODY’S INVOLUNTARY ACTIONS DIVISIONS OF THE NERVOUS SYSTEM: THE CENTRAL NERVOUS SYSTEM • SPINAL CORD • THE LINK BETWEEN THE BRAIN AND THE PERIPHERAL NERVOUS SYSTEM DIVISIONS OF THE NERVOUS SYSTEM • PERIPHERAL NERVOUS SYSTEM • CONSISTS OF A NETWORK OF NERVES THAT BRANCH OUT FROM THE CENTRAL NERVOUS SYSTEM AND CONNECT IT TO THE REST OF THE BODY • INVOLVED IN BOTH INVOLUNTARY AND VOLUNTARY ACTIONS • TOTAL OF 43 PAIRS OF NERVES DIVISIONS OF THE NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM • DIVIDED INTO 2 GROUPS • 1. SOMATIC NERVOUS SYSTEM • CONTROLS VOLUNTARY ACTIONS • 2. AUTONOMIC NERVOUS SYSTEM • CONTROLS INVOLUNTARY ACTIONS THE NERVOUS SYSTEM • REFLEXES • AN AUTOMATIC RESPONSE THAT OCCURS VERY RAPIDLY AND WITHOUT CONSCIOUS CONTROL • SIGNALING THE BRAIN • NERVE IMPULSES REACH BRAIN AND ARE INTERPRETED • TAKES LONGER FOR THE PAIN IMPULSE TO REACH BRAIN AND BE INTERPRETED THEN IT DOES FOR THE REFLEX ACTION TO OCCUR THE NERVOUS SYSTEM • NERVOUS SYSTEM INJURIES • CONCUSSION • A BRUISELIKE INJURY OF THE BRAIN • SPINAL CORD INJURIES • OCCUR WHEN SPINAL CORD IS CUT OR CRUSHED THE NERVOUS SYSTEM • NEURONS • CELLS THAT CARRY INFORMATION THROUGHOUT THE NERVOUS SYSTEM THE NERVOUS SYSTEM NEURONS • 3 KINDS OF NEURONS • 1. SENSORY NEURONS • PICKS UP STIMULI FROM INTERNAL OR EXTERNAL ENVIRONMENT AND CONVERTS INTO A NERVE IMPULSE • 2. INTERNEURON • CARRY NERVE IMPULSES FROM ONE NEURON TO ANOTHER • 3. MOTOR NEURONS • SENDS NERVE IMPULSES TO A MUSCLE OF GLAND AND THE MUSCLE OR GLAND REACTS IN RESPONSE THE NERVOUS SYSTEM • NERVE IMPULSE • MESSAGE THAT A NEURON CARRIES • BEGIN IN DENDRITE, MOVE TOWARD THE CELL BODY, THEN MOVE DOWN THE AXON • SYNAPSE • JUNCTION WHERE ONE NEURON CAN TRANSFER AN IMPULSE TO ANOTHER