Nervous System Headings Vocabulary Key/Important Stuff.

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Nervous System Headings Vocabulary Key/Important Stuff

Nervous System Types A. Central Nervous System (CNS) 1. Brain and spinal cord 2. Control center of the body B. Peripheral Nervous System (PNS) 1. Carries impulses to and from the CNS www.brain.com

Infant & Adult Spinal Cords 3 Types of Neurons Neurons – nerve cell: conducts impulses through nervous system 1. Sensory neurons 2. Motor neurons 3. Inter neurons

C. Structure of Neurons 1. Cell body - nucleus and cytoplasm 2. Dendrites - carry impulses toward the cell body 3. Axon - carry impulses away from cell body (to other neurons, muscles or glands) 4. Myelin Sheath - fatty layer covering the axon *** When a neuron fires - movement of impulse occurs Dendrite  Cell body Axon  next nerve cell's dendrite or muscle****

Transmission of impulses A. Reception- receives impulse B. Transmission - impulse moves to CNS C. Interpretation - brain decodes D. Transmission - message moves to body E. Response - reaction to stimulus

Describe the Brain c. Brain Stem - all nerves of spinal cord A. Brain – controls reactions in the body B. 3 main parts Cerebrum- 2 hemispheres ( controls intelligence, memory, language, senses) 1. Receive sensory impulses 2. Each side controls opposite side of the body b. Cerebellum - underside of the brain 1. Coordinates voluntary muscles (balance, posture, & coordination) c. Brain Stem - all nerves of spinal cord 1. Primitive brain controlling body functions (breathing & heart rate)

Describe the Brain C. Meninges – tissue layers protecting the brain

Drug Terms Classes of drugs A. Drug - any chemical capable of reacting with body functions B. Addiction - psychological and physiological dependence on the drug C. Tolerance - need for larger and more frequent doses to achieve the same effect D. Withdrawal – effects caused when you stop taking the drug A. Stimulants - irregular heart beat, chest pains, paranoia convulsions, coma B. Depressants- cirrhosis, addiction C. Narcotics - lowers heart beat, slows breathing D. Hallucinogens - convulsions, increase heart rate

Effects of drugs on unborn child Uses of drugs Effects of drugs on unborn child A. Relieve pain B. Treat problems /disorders Cancer A. Low birth weight B. Birth defects C. Irritability D. Mental retardation ADD Hemispherectomy Epilepsy FAS Chronic Fatigue Syndrome

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