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7th grade science Nervous System

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CNS
the central nervous system is includes the brain and spinal cord.
spinal cord
part of the central nervous system that contains interneurons and connects the brain with the rest of the body.
central nervous system
the main nervous system consisting of the brain and the spinal cord
peripheral nervous system
the secondary nervous system containing nerve extensions running out from the spinal cord to all parts of the body.
voluntary movements
Movements that you control. You know about them before they happen
right hemisphere
right cerebrum, controls left side of body mainly.
left hemisphere
Left cerebrum, controlls right side of body.
brain stem
most primitive part of the brain which controls involuntary reflexes such as breathing, digestion, heart rate, etc.
cerebellum
Back of brain below occipital lobe. Balance, Coordination, Movement.
cerebrum/cerebral cortex
Left and right hemispheres. The thinking part of the brain which controls all thought.
frontal lobes
Front of brain. Planning for the future, scheduling, short term memory.
neuron/nerve cell
a type of cell which passes electrical impulses to the brain and spinal cord. Relays heat, pain, texture.
dendrites
extend from the cell body of a neuron, and recieve messages from other cells
synapse
the space between two neurons through which neurotransmiters travel
rods and cones
receptors in the eye which allow organisms to see in color and shades
myelin sheath
a layer of fatty tissue encasing a neuron's axon that speeds transmission
dendrites
carry impulses to the nerve cell body.
axon
long fiber that carries impulses away from the cell body of a neuron
peripheral nervous system
consists of nerves and sensory receptors
Name 4 brain disorders and explain what each does?
1.MS--multiple sclerosis--the myelin sheath that protects the nerves hardens, limiting the travel of electrical impulses.
2. ALS--amyotrophic lateral sclerosis--known as Lou Gehrig's disease--the motor neurons are gradually destroyed and the muscles that depend on those nerves become useless. The brain shrinks.
3. Epilepsy--neurons release their electrical charges suddenly causing a seizure.
4. Meningitis the layers of the connective tissue that surrounds the brain and spinal cord swell. It can cause paralysis and death.
What are the 3 different groups of neurons?
Sensory neurons-sends information from the sense organs to the brain.
Motor neurons--carry electrical impulses from the brain or spinal cord to the muscles or glands.
Association neurons--which function in reflexes, which transfer electrical impulses from a sensory neuron directly to a motor neuron.22