what are the 3 parts of the nervous system? · 2018. 3. 23. · mar 13 8:41 pm. there are three...
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Nervous System
Nerve CellsReceptors Effectors
Receptor-organs or cells thatdetect stimuli and
convert the stimulito impulses.
What are the 3 parts of the NERVOUS SYSTEM?
Effector A structure thatresponse to a stimulus[Example: Muscle& Gland]
carries
out the
Neuron
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Sense organs and receptorsThe five sense organs:
1)____________
2)____________
3)____________
4)____________
5)_____________
Ear [cochlea][mechanoreceptor
Mouth [tastebuds][Chemoreceptors]
Eyes [Retina][Photoreceptor]
Skin [thermoReceptors
Pressure ReceptorsPain Receptorshttps://www.youtube.com/watch?v=E4Ep1atfFlg
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Effectors: muscles or glands that respond to nervous impulses
Stimulus (light)
Receptor(cells in the eye)
Effector
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There are three types of neurons1)Sensory Neuroncarries impulses from the sense organs to the spinal cord or brain. (CNS)
2) Motor Neuroncarries impulses from the brain and spinal cord to muscles and glands(effectors)
3) Interneuronsconnect sensory and motor neurons and carry impulses between them. Most are located in the brain and spinal cord(CNS)
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What is a nerve?
A bundle ofneurons surrounded
by connective tissue
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Human Nervous System
Central Nervous System Peripheral Nervous
Systemconsists of
The Brain and Spinal Cord
consists ofAll nerves outside the CNS. Sensory and Motor NeuronsAll Nerves that comeoff the brain &spinal cord
-Nerves coming offthe brain
nerves
-Nerves coming offthe spinal cord
-spinal nerves
-cranial
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What are the 2 DIVISIONS of the Nervous System ?
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What protects the brain?Central Nervous System
l. Skull2. Meninges
3. Cerebrospinalfluid
-bone
membranes that
protect the brain
fluid surrounding
brain &sp. cord
that protects & nourishes
the brain
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Cerebrum
Cerebellum
Medulla Oblongata
Brain
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Cerebrum: • the largest part of the brain. • Center for thinking, memory and voluntary activities, and senses
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Cerebellum: • coordinates motor activities • helps maintain balance
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Medulla Oblongata:controls many involuntary activities including breathing, heartbeat, and blood pressure
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hypothalamus- Link between the nervous and endocrine system-helps regulate body Temperature-It helps to regulate appetite, thirst
Blood pressure, sleep, and emotions
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Thalamus
consciousness, sleep, and sensory interpretation.
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What protects the spinal cord?
Spinal Cord 1) vertebrae (bones)
2) meninges (membranes)
3) Cerebrospinal fluid.
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Spinal Cord: A Thick nerve a) It carries nerve impulses between the brain and other structures of the body.
b) controls certain reflexes (automatic responses to stimuli)
Attachments
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