Neural Tissue
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| cells that send and receive signals | neurons
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| cells that support and protect neurons | neuroglia (glial cells)
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| Spinal Cord and brain | Central nervous system (CNS)
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| Neural tissue outside the spinal cord and brain | peripheral nervous system (PNS)
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| bundles of axons with connective tissues and blood vessels. Carry sensory information and motor commands in PNS | Nerves
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| nerves that connect to the brain | cranial
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| nerves that attach to the spinal cord | spinal
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| carries sensory information from PNS sensory receptors to CNS | Afferent division
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| carries motor commads from CNS to PNS muscles and glands | Efferent division
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| detect changes or respond to stimuli. Neurons and specialized cells. eyes, ears | receptors
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| respond to efferent signals. cells and organs | effectors
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| controls skeletal muscle contractions; voluntary and involuntary muscle contractions | Somatic nervous system (SNS)
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| controls subconscious actions: contractions of smooth muscle and cardiac muscle and glandular secretions | Autonomic Nervous system (ANS)
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| has a stimulating effect | sympathetic division
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| has a relaxing effect | parasympathetic division
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| area where a neuron communicates with another cell | synapse
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| contributes to half the volume of the nervous system | neuroglia
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