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43 Cards in this Set
- Front
- Back
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nervous tisses does 2 things |
controls all body activities within limits that maint life |
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nervous tissue consists of 2 things |
neurons neuroglial cells
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3 bascial functions of |
sensing changes with sensory receptors (sun on face)
interpreting and remembering those changes
reacting to hose changes |
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somantic nervous system |
skeletal musclula contractions |
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autonomic nervous system |
glandular secretions |
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CNS |
brain and spinal cord |
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PNS |
is everything except brain and spinal cord |
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peripheral nervous system consists of |
Peripheral nevous system consist of cranial and spinal nerves that contain both sensory and motor fibers |
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peripherpheral nevous system conntects CNS to |
connects CNS to muscles glands all sensory receptors |
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somatic (voluntary) nervous system |
neurons from cutaneous and special sensory receptors (eyes, ears, nose & taste buds) to the CNS
motor neurons to smooth & cardiac muscle and glands |
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sympathetic divison |
speeds up heart rate |
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parasympathetic division |
(slows down the heart rate |
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Enteric Nervous system |
involuntary sensory & motor neurons contrl GR trracts |
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neurons function independatly of |
ANS and CNS |
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what are neurons |
Neurons are the functional unit or nervous system |
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(electrical excitability) neurons have a capacity |
neurons have capacity to produce actions potentioals |
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cells body |
single nucleus with prominent nucleolus lipofuscin orgment clumps (harmless aging) Microtubles move material inside cell neufilaments give cell shape and support nissl bodies (chromatophillic substance) -rough ER & free ribosomes for protein synthesis |
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Nissl bodies (chromatophilic substance) |
rough ER & free ribosome for protein synthesis |
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neurofilaments give what |
neurofilaments give cell shape and support |
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microtubules do what ? |
microtubules move material inside cell |
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lipofuscin pigment clumps |
harmless aging |
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cell process |
dendrites & axons |
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dendrites do what |
dendrites conducts impulses towards the cell body |
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dendrites are |
dendrites are typically short highly branches unmeylinated |
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dendritrs surfaces specialized for |
dendrites surfaces specialized for contact with other neurons |
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dendrites contain |
dendrites contain neurofibrils and nissl bodies |
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axons do what |
axons conduct impulses away from cell body |
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axons strcutre |
long, thn cylindrical process of cell |
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axon arises as |
axon arises at axon hillock |
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trigger zone |
axon impulses arise from initial segment |
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side branches (collaterals) end in |
side branches(collaterals) end in fine processes called axon terminal |
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axon terminals |
side branches (collaterals) end in fine processes |
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synaptic end bulbs |
swollen tips contain vesicles filled with neurotransmitters |
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cell body is location for |
cell body is the location for most protein synthesis
neurotransmitters & repair proteins |
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axonal transport system does what |
axonal transport system moves substances |
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slow axonal flow |
(for growth & regeneration)
movement in one direction only --away from cell body movement at 1-5mm per day from flow of axoplasm |
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fast axonal flow |
(for endo-excosytosis)
moves organelles & materials along surface of microtubules
at 200-400 mm per day
transports in either direction
for use (secretory vescicles) or for recycling in cell body |
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fast axonal flow moves |
moves organelles & material along surface of microtubutles |
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fast axonal flow transports |
fast axonal flow transports in either direction |
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fast axonal flow use |
recycling in cell body |
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sensory (afferent) neurons |
transport sensory information from skin, muscles, joints, sense organs & viscera to CNS |
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Motor (efferent) neurons |
sends motor nerve impulses to muscles & glands
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interneurons (association) neurons |
connects sensory to motor neurons 90% of neurons in the body |
