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CCMA CH 6

CCMA CH 6 REVIEW (Body Systems - Nervous)

TermDefinition or Function
nervous system controls all other body systems - divided into 2 main sections (CNS and PNS)
brain - coordinates most of body activities - control center for body, thought, emotion, and judgement - has 4 lobes (frontal, parietal, occipital, temporal)
spinal cord - provides pathway for nerve impulses travelling to and from the brain - extends from base of the brain to lumbar vertebrae through vertebral column
peripheral nerves - includes 12 pairs of cranial nerves and 31 pairs of spinal nerves branching off the spinal cord - carries nerve signals between the body and the brain
neuron functional unit of the nervous system
dendrites has multiple branching structures
nucleus directs cellular activities
cytoplasm produces neurotransmitters and energy for the neruon
axon stores neurotransmitters
central nervous system (CNS) consists of the brain and spinal cord
afferent nerve cells neurons - carry information about the body's environment to the CNS - neuron is able to generate an electrical impulse when stimulated
efferent nerve cells carry responses from the CNS to the body to initiate action
peripheral nervous system (PNS) consists of peripheral nerves throughout the body
somatic nervous system (SNS) controls body's voluntary (skeletal) muscles
automatic nervous system (ANS) controls body's automatic functions (breathing, digestion)
sympathetic nervous system controls "fight or flight" stress response
parasympathetic nervous system controls "rest & digest" to return body back to resting state
Created by: linju156
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