760427
Description
Mind Map by georgia_x_barnes, updated more than 1 year ago
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Created by georgia_x_barnes
over 10 years ago
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Biology the nervous system
- sense organs detect stmuli
- stimuli is a change in your environment
- stimuli is a change in your environment
- 5 different sense organs-ears,eyes,nose,tonge&skin
- all contain diff receptors-are groups of cells which are sensitive to a
stimulus. they change stimulus energy into electrical impulses.
- a stimulus could be light,sound,touch,pressure,pain,chemical or a change in position or temperature.
- all contain diff receptors-are groups of cells which are sensitive to a
stimulus. they change stimulus energy into electrical impulses.
- 5 sense organs&receptors
- eyes-light receptors-sensitive to light&cells have
nucleus,cytoplasm&cell membrane(like most animal cells)
- ears-sound receptors-sensitive to sound-also
balance receptors to changes in position
- nose-smell receptors-sensitive to chemical stimuli
- tounge-taste receptors-sensitive to
bitter,sour,salt&sweet&savoury things-chemical stimulus
- skin-sensitive to touch,pressure,pain and temp change
- eyes-light receptors-sensitive to light&cells have
nucleus,cytoplasm&cell membrane(like most animal cells)
- sensory neurones-nerve cells carry signals as electrical impulses
from the recpeptors in the sense organs to central nervous system
- Relay neurone-nerve cells carry signals from sensory Neurones to motor neurones
- motor neurones-nerve cells carry signals from central nervous system to effector muscles or glands
- Effectors
- respond in diff ways. muscles contract in response to a nervous impulse,
whereas glands secrete hormones
- respond in diff ways. muscles contract in response to a nervous impulse,
whereas glands secrete hormones
- Central Nervous System(CNS)
- coordinates a response
- all info from sense organs is sent&where reflexes &actions are coordinated.
- consists of brain&spinal chord only.
- coordinates a response
- neurones(nerve cells) transmit info(as electrical
impulses)very quickly to&from CNS instructions from CNS
are sent to the effectors(muscles&glands) which respond
accordinly.
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