Nervous System
- Created by: hanabhatti1
- Created on: 28-05-18 14:47
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- Homeostasis
- Negative Feedback
- when level is too high/low
- effector produces response, counteracts change & restores optimum level
- when level is too high/low
- Nervous system
- Central Nervous System (CNS)
- in animals with backbones, consists of brain & spinal cord, connected to body by sensory & motor neurones
- coordination centre, sends electrical impulses down other neurones to effectors
- Effectors
- bring about a response, usually a muscle which contracts, or a gland which secretes hormones
- Sensory neurones
- carry information as electrical impulses from receptors to CNS
- Motor neurones
- carry electrical impulses from CNS to effectors
- Receptors
- cells that detect stimuli
- Central Nervous System (CNS)
- Synapses
- connection between two neurones
- nerve signal is transferred by chemicals which diffuse across gap, then set off a new electrical signain next neurone
- Reflexes
- help prevent injury, rapid & automatic responses to certain stimuli
- don't involve conscious part of brain
- in bright light, our pupils dilate, stops it getting damaged
- don't involve conscious part of brain
- goes through spinal cord through unconscious part of brain
- when a stimulus detected by receptors, impulses sent along a sensory neurone to a relay neurone in CNS
- impulses reach a synapse between s&r neurone
- they trigger chem. to be released, cause impulses to be sent along relay neurone
- impulses reach a synapse between s&r neurone
- when a stimulus detected by receptors, impulses sent along a sensory neurone to a relay neurone in CNS
- stimulus
- receptor
- sensory
- relay
- motor
- effector
- motor
- relay
- sensory
- receptor
- help prevent injury, rapid & automatic responses to certain stimuli
- Negative Feedback
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