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The nervous system is made up of _________, which are the functional and structural part of the N.S.
nerves
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Sensory neurons
Found in sense organs, and pick up stimuli and sent it to the brain.
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Interneurons
Found in the brain and spinal cord, relay information from the sensory neurons to the motor neurons
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Motor Neurons
Found in the muscles and glands, and carry impules to muscles and causes them to react.
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2 Main Divisions of the Nervous System
- Central Nervous System
- Peripheral Nervous System
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Central Nervous System
Consists of the brain and spinal cord.
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Peripheral Nervous System
Made up of nerves that branch out from the CNS to muscles, skin, internal organs, and glands
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The____________recieves, interprets, and relays information
Cell Body
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__________recieve and carry impulses to the cell body.
Dendrites
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An_____carries impulses awa from the cell body
Axon
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Synapse
Junction between the axon of a neuron and the dendrites of other neurons that information crosses
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Neurotransmitters
Small paricals that help carry information across the synapse.
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Spinal Cord
About as big around as your index finger and 2 feet long. It containse 10 billion nerve cells. It is protected by the vertebrae.
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Brain
Largest most completx part of nervous system, and is the bodies control center. It is protected by the skull.
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3 parts of Brain
- Cerebrum
- Cerebellum
- Brain Stem
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Cerebrum
Largest part of the brian; controlls the ability to memorize, think, and learn; determines a person's intelligence and personality.
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Cerebellum
Part of the brain that controlls and coordinates muscle activity; maintains balance
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Brain Stem
Part of the brain that controlls the functions of the internal organs
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A______________ is a spontaneous action in which a message is sent to the spinal cord, is interpreted, and is responded to immediatley.
Relex Action
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4 types of problems that occur in the nervous system
- Injuries (Concussion, contusion)
- Degenerative Diseases (get worst over time-Alzheimers)
- Communicable Diseases (can be spread from one to another-Meningitis)
- Genetic Disorders (passed through heredity-Down Syndrome)
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