Divisions of nervous system:
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Central Nervous System:
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Peripheral Nervous System:
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Locate right in the center of the body.
The nerve structure that locate everywhere rather than the CNS
Central Nervous System:
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Brain:
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Cerebrum: largest brain area
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Thinking
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Memory
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Emotion
Cerebellum
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interpret the information collected by ear (semicircular canal), and eye
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Keep physical balance
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Brainstem
Spinal cord:
long rod that protected by the spine
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semicircular canal: helps to sense body position.
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Semi-
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Circular-:
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Canal: tube
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Hair cells covered by gel-like fluid submerged in fluid
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Sensitive to rotating body movements
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Hair cells are evoked. (hair cells pick up the stimulus/vibration)
✤
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Sensory neuron connected with hair cells produces electrical signal.
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Signal pass to the brain (cerebellum).
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Brain interprets the body position.
1)
Eye opened, stand on one foot: stand longest
2)
Eye closed, stand on one foot: stand shorter
3)
Eye opened, after quick spinning over 30 times, stand on foot
4)
Eye closed, after quick spinning over 30 times, stand on foot
Independent variable (IV):
the only difference among groups
✤
Dependent variable (DV):
depend on IV. The results of the experiment.
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Controlled variable (CV):
Factors that are same of all groups.
IV in case-1&2: eye open or close
Information input through eyes also participate
DV in case-1&2: how long can a person stand on one foot.
the maintain of body balance.
Soundwave: vibration of particles of the medium
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Pinna:
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Ear canal:
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Collect the soundwave.
Funnel down the soundwave.
Ear drum
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Conduct the vibration to inner structure (3 tiny bones)
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Enlarge the soundwave