The Nervous System
- Created by: nicole beaumont
- Created on: 16-10-18 21:05
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- The Human Nervous System
- It is made up of different parts
- Central Nervous System- in vertebrates it consists of the brain and spinal cord. It is connected by the rest of the body by sensory and motor neurons
- Sensory Neurones- These carry information as electrical impulses from the receptors to the CNS
- Motor Neurones- these carry electrical impulses from the CNS to the effectors
- effectors- all your muscles and glands which respond to nervous impulsus
- receptors and effectors can form part of complex organs
- receptors are the cells that detect stimuli
- there are many different types of receptors such as taste receptors on the tongue and sound receptors in the ears
- effectors respond to nervous impulses and bring about change
- Muscles and glands are known as effectors- they respond in different ways. Muscles contract in response to a nervous impulse whereas glands secrete hormones.
- synapses connect neurones
- the connection between 2 neurones is called a synapse.
- The nerve signal is transferred by chemicals which diffuse (move) across the gap. These chemicals then set off new electrical signal in the next neurone
- the connection between 2 neurones is called a synapse.
- reflexes help prevent injury
- Reflexes are rapid and automatic responses to certain stimuli that don't involve the conscious part of the brain
- example-if someone shines a bright light in your eye your pupils automatically get smaller
- reflex arc
- It is made up of different parts
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