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B5 Nervous System (Receptors (Groups of specialised cells, Detect a change…
B5 Nervous System
Receptors
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Skin stimulus - Touch, temperature and pain
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Reflex
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Sensory neurone sends electrical impulses to relay neurone in the spinal cord, they connect sensory to motor neurones
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Synapse
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Neurotransmitter - Chemical involved in passing nerve impulses from one nerve cell to the next across a synapse
Chemicals diffuse across the synapse and bind with receptor molecules on the membrane of the second neurone
Receptor molecules on the second neurone bind to specific neurotransmitters released from the first neurone
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Homeostasis
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Control of blood glucose, body temperature and water levels
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Brain
Cerebrum - Outer layer called cerebral cortex, split into two hemispheres and highly folded
Cerebruk controls intelligence, personalist, conscious thought and high level functions eg language
Cerebellum - Controls balance, co-ordination of movement and muscular activity
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Nerve cells
They are called neurones and are adapted to carry electrical impulses, a group of them is called a nerve
Axon - Long fibre insulated by a fatty sheath, long to carry messages up and down the body
Dendrons - Tiny branches which branch further as dendrites, receive incoming impulses from other neurones
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Control systems
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Coordination centre (brain, spinal cord, pancreas) receives and processes info from receptors
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