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Cards In This Set
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The master controlling and communicating system of the body
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Nervous system
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Nervous system functions (in order)
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1) sensory receptors monitor changes in/out of body (stimuli); 2) it processes and interprets the sensory input and decides what should be done at each moment (integration), 3) effects a response by activating muscles or glands (efectors) via motor output
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CNS is made up of ____________ and it does this ___________
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Brain and spinal cord; interprets incoming sensory info and sends instructions based on past experience and current conditions
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PNS is made up of ________________ and it does this ___________
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Mainly nerves; spinal nerves carry impulses to and from the spinal cord. Cranial nerves carry impulses to and from the brain.
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This subdivision consists of nerves that send impulses to the CNS from sensory receptors; it keeps the CNS constantly informed of events going on in/out of body
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Afferent/sensory division of PNS
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Carries impulses from CNS to effector organs, muscles, glands; these impulses activate muscles and glands; they effect a motor response
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Efferent/motor division of PNS
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_____ allows us to consciously/voluntarily control skeletal muscles. AKA voluntary nervous system. It is a subdivision of _________
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Somatic nervous system; efferent division
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_______ regulates events that are automatic/involuntary; AKA involuntary nervous system. It is a subdivision of _______
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Autonomic nervous system (ANS); efferent/motor division
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ANS two parts _______ and ________
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Sympathetic and parasympathetic
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Cells that generally support, insulate, and protect delicate neurons; lumped together supporting cells
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Neuroglia or glia
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Glia that wrap their flat extensions tightly around nerve fibers, producing fatty insulating coverings called myelin sheaths
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Oligodendrocytes
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These cells form the myelin sheaths around nerve fibers found in PNS
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Schwann cells
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These cells act as protective, cushioning cells
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Satellite cells
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Nerve cells are called _____; their specialty is to: _____
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Neurons; transmit messages
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Neuron processes that convey incoming messages toward the cell body are ______
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Dendrites
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