NERVOUS SYSTEM
Biology, Human and Animal Biology, Age 11-14, Age 14-16
power point presentation to introduce the nervouse system. Foundation GCSE or KS3
Looking for something similar to NERVOUS SYSTEM ?
1NERVOUS SYSTEMIts function is to control and co-ordinate the parts of the body.© Teachable and Jan Stevens. Some rights reserved. http://teachable.net/res.asp?r=65102CENTRAL NERVOUS SYSTEMPERIPHERAL NERVOUS SYSTEM© Teachable and Jan Stevens. Some rights reserved. http://teachable.net/res.asp?r=65103NERVE CELLS (NEURONES)Specialised cells that can carry electro-chemical messages called NERVE IMPULSES. SENSORY NEURONESThese carry impulses from a sense organ towards the CNS.Direction of impulseReceptorDendriteCell bodyAxonBranches forming synapse© Teachable and Jan Stevens. Some rights reserved. http://teachable.net/res.asp?r=65104MOTOR NEURONESThese carry impulses from the CNS to an EFFECTOR (a muscle or a gland).Direction of impulseDendritesCell bodyAxonNerve endings on a muscleBoth sensory and motor neurones are very long (up to 1m in a human). This helps to reduce the synapses (connections) needed.© Teachable and Jan Stevens. Some rights reserved. http://teachable.net/res.asp?r=65105NERVESA nerve is a bundle of nerve fibres (cells). Most nerves carry a mixture of sensory and motor fibres.© Teachable and Jan Stevens. Some rights reserved. http://teachable.net/res.asp?r=65106SYNAPSESNerve impulses can travel at up to 100m per sec but when they reach the end of a cell they have to cross a gap called a SYNAPSE.
