The Nervous System 0.0 / 5 ? BiologyNervous system, hormones and behaviourGCSEEdexcel Created by: TillyGarfootCreated on: 19-04-19 17:59 What components are in the central nervous system? The brain and spinal cord 1 of 26 What components are in the peripheral nervous system? Sense organs and neurones 2 of 26 Function of the brain Controls all complex behaviour. It is made up of 86billion connecting neurones and has different regions that carry out different functions 3 of 26 Cerebrum This is the largest part of the brain. The right hemisphere controls muscles on the left side of the body and visa versa 4 of 26 Cerebellum Responsible for muscle coordination and balance 5 of 26 Medulla Oblongata Controls unconscious activities like breathing, heart rate and sneezing 6 of 26 CT Scanner Uses X rays to produce an image of the brain 7 of 26 Stimulus A change in an organisms surroundings 8 of 26 Receptor Something which detects a change in an organisms surroundings 9 of 26 Effector A muscle or gland that brings about a response to a stimulus 10 of 26 Neurones Specialised cells which carry electrical impulses 11 of 26 Dendron Carries the message before the cell body in a sensory neurone 12 of 26 Myelin sheath Insulation in a neurone 13 of 26 Axon Carries the message after the cell body in a sensory neurone 14 of 26 Sensory neurones Neurones that link sense organs to the CNS 15 of 26 Relay Neurones Neurones within the CNS which may be very short 16 of 26 PET Scanners Dye is injected into the body so that problems can be highlighted visually 17 of 26 Motor neurones Neurones that connect the CNS to an effector such as a muscle 18 of 26 Reflex actions Rapid, automatic responses of the nervous system which do not involve conscious thought 19 of 26 Reflex arc Signals pass directly from a sensory neurone via a relay neurone to a motor neurone 20 of 26 Synapse Where two neurones meet, there is a tiny gap called a synapse 21 of 26 Neurotransmitters Signals which cross a synapse 22 of 26 Ciliary muscle Involved in changing the shape of the lens 23 of 26 Cornea Refracts light rays 24 of 26 Pupil A hole allowing light to enter the eye 25 of 26 Iris Regulates the amount of light entering the pupil 26 of 26
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