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The Nervous System & Sensitivity PowerPoint Presentation

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Slide 1 - The nervous system
Slide 2 - What is the nervous system made up of? The brain The spinal cord The nerves (neurones) The central nervous system (or CNS for short) is made up of the brain and the spinal cord.
Slide 3 - What is the job of the nervous system? Our survival depends on us being sensitive to our surroundings. We need to be able to detect any changes and be able to respond to them.
Slide 4 - What are our sense organs? The sense organs are: The eyes The ears The nose Tongue skin These organs sense: Light Sound and balance Smell Taste Pressure, pain, temperature
Slide 5 - How does our nervous system work then? Our sense organs contain special receptor cells which will detect a change in our surroundings (a stimulus) The receptor cells will change the stimulus into an electrical impulse which is passed along nerve cells The message will usually go to the brain which will then process it The brain then sends a message along nerves to an effector organ (usually a muscle or a gland) The effector organ will then give a response (e.g. a muscle will move, or a gland will produce a hormone)
Slide 6 - Stimulus Receptor Sensory neurone Central Nervous system Motor neurone Effector Response
Slide 7 - Synapses When a nerve ending meets up with another nerve ending we get a microscopic space This space is called a synapse The electrical message travelling along a nerve has to cross the synapse as a chemical message When the chemical (neurotransmitter) reaches the other nerve ending it causes an electrical impulse to travel along the next nerve cell
Slide 8 - Reacting without thinking Sometimes a stimulus requires an immediate response. This is called a reflex action. It is an involuntary response and we do it without thinking. These automatic responses do not have to be learned. They can be very important in preventing injury to ourselves.
Slide 9 - A reflex arcThe nerve pathway taken in a reflex action is called a reflex arc. The nervous message goes to the spinal cord, then a message passes from the spinal cord directly to an effector to give an immediate response.
Slide 10 - A reflex arc
Slide 11 - The knee jerk reflex action Sometimes called a relay or Connector neurone
Slide 12 - Another reflex action
Slide 13 - Examples of responses Voluntary actions Eating a cake Riding a bicycle Walking Playing the piano Coming to school Involuntary actions Your heart beat Breathing Blinking Removing hand from hot object Choking Salivating
Slide 14 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
 

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