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1.Central Nervous System (CNS)

structure: brain and spinal cord
function: integrative and control centers

2.Peripheral Nervous System (PNS)

structure: cranial nerves and spinal nerves
function: communicate lines between CNS and rest of body

3a.Sensory (afferent) division

structure: somatic and visceral sensory nerve fibers
function: conducts impulses from receptors to CNS

3b.Motor (efferent) division

structure: motor nerve fibers
function: conducts impulses from CNS to effectors (muscles and glands)

4a.Somatic nervous system

structure: somatic motor (voluntary)
function: conducts impulses from CNS to skeletal muscles

4b.Autonomic nervous system (ANS)

structure: visceral motor (involuntary)
function: conducts impulses from CNS to cardiac muscles, smooth muscles, and glands

5a.Sympathetic division

function: mobilizes body systems during activity

5b.Parasympathetic division

functions: conserves energy; promotes house-keeping functions during rest

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