The Nervous System Miss Charney Northville Central School Miss Charney Northville Central School.
-
Upload
melvyn-fowler -
Category
Documents
-
view
223 -
download
2
description
Transcript of The Nervous System Miss Charney Northville Central School Miss Charney Northville Central School.
The Nervous SystemMiss Charney
Northville Central School
Nervous System Functions Receives information
about what is happening to your body Stimulus - change or
signal that makes the body react
Directs the way in which your body responds to the information Response - what your
body does in a reaction
Neurons Cells that carry information
through your nervous system
Nucleus - directs the actions of the neuron
Dendrites - carry impulses toward the neuron’s cell body (can have many)
Axon - carries impulses away from the cell body (can have only one)
Types of NeuronsMotor Neuron: sends impulses to
a muscle or gland
Sensory Neuron: picks up stimuli from the internal or external environment and converts the stimulus into a nerve impulse
How An Impulse TravelsSynapse: the junction where one
neuron can transfer an impulse to another
How An Impulse Travels
How An Impulse Travels1. Nerve impulses begin when receptors
pick up stimuli from the environment2. Receptors trigger nerve impulses in
sensory neurons3. Nerve impulses pass to interneurons in
the brain4. Your brain interprets the impulses5. Impulses travel along thousands of
motor neurons6. Motor neurons send the impulses to
muscles, which carry out the response
Parts of the Nervous System
Central Nervous System Control center of the body
Brain: located in the skull, is the part of the CNS that controls most functions in the body
Spinal Cord: thick column of nervous tissue the links the brain to most of the nerves in the peripheral nervous system
Parts of the Brain Cerebrum: largest
part of the brain Interprets input from the
senses, controls movement, and carries out complex mental processes such as learning and remembering
Left half - mathematical skills & logical thinking
Right half - creativity & artistic ability
Parts of the BrainCerebellum: second
largest part of the brainCoordinates actions of
your muscles and helps you to keep balance
Parts of the BrainBrain Stem:
between the cerebellum and the spinal cordControls your body’s
involuntary actions such as breathing and heart rate
Peripheral Nervous System
network of nerves branching out from the CNS and connect to body
Somatic Nervous System: control voluntary actions such as using a fork or tying your shoes
Automatic Nervous System: control involuntary actions
Reflexes Automatic response that
occurs very rapidly and without conscious control
Reflex Pathway:1. Sensory neurons in your
fingertip detect a pain stimulus2. Nerve impulses travel to your
spinal cord3. Nerve impulses return to motor
neurons in your hand, and you pull your hand away
4. As you pull your hand away, nerve impulses travel to your brain. You feel the pain