nervous system 3.0 / 5 based on 1 rating ? BiologyNervous system, hormones and behaviourGCSEAQA Created by: ninaCreated on: 21-05-13 21:21 what does the nervous system allow the body to do? respond to changes in the environment and coordinate its behaviour 1 of 29 what is a stimulus? a change in the environment 2 of 29 what do receptors do? detects the change in the environment 3 of 29 what does a coordinator do? receives impulses from the receptor and processes the information 4 of 29 what does an effector do? receives impulses from the coordinator which enables a response 5 of 29 what is a response? the action performed as a result of the initial stimulus 6 of 29 what are receptors? groups of specialised cells that detect changes in the environment 7 of 29 where are receptors located? sense organs 8 of 29 what are receptors in the eye sensitive to? light 9 of 29 what are receptors in the ear sensitive to? sound and the position of the head 10 of 29 what are receptors in the tongue sensitive to? chemicals in food 11 of 29 what are receptors in the nose sensitive to? chemicals in air 12 of 29 what are receptors in the skin sensitive to? touch, pain, pressure, temperature 13 of 29 what do light receptor cells have in common with animal cells? nucleus, cytoplasm and cell membrane 14 of 29 what happens when a receptor is stimulated? signals are sent along nerve cells (neurones) to the CNS 15 of 29 what are neurones? individual nerve cells that are specialised to transmit electrical impulses 16 of 29 what are nerves? groups of neurones that connect receptors and effectors to the CNS 17 of 29 what does the Central Nervous System consist of? brain and spinal cord 18 of 29 what is the brain's job? to process information and coordinate 19 of 29 how could you calculate the time taken for nervous impulses to be transmitted? by finding the time interval between the stimulus and response 20 of 29 what do sensory neurones do? carry impulses form the receptor to the CNS 21 of 29 what do relay neurones do? carry impulses from different parts of the CNS 22 of 29 what do motor neurones do? carries impulses from the CNS to the effector 23 of 29 what are impulses? information sent around the CNS 24 of 29 what is the junction between two neurones called? synapse 25 of 29 what is the name of the chemical diffused across a synapse? neurotransmitter 26 of 29 if you have caffeine, what effect will this have on the amount of chemicals in the synapse? increase, making you more alert 27 of 29 if you have alcohol,what effect will this have on the amount of chemicals in the synapse? decrease, making you less alert 28 of 29 what are types of effectors? muscles and glands 29 of 29
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