2 Regulation: HOMEOSTASIS! The life process by which the human body responds to its changing (inside and outside) environment.Constant adjustments made as a result of the changing environment help maintain…HOMEOSTASIS!
3 Nervous System Endocrine System Regulation:Nervous SystemEndocrine System
4 Main Function: The Nervous System Responds to internal and external stimuliby controlling and coordinating functions throughout the bodyOur nervous system allows us to feel pain and react to it!
5 brain, spinal cord, nerves and sense organs The Nervous SystemConsists of:brain, spinal cord, nerves and sense organsSense Organs: Eyes, Skin, Ears, Nose & Tongue
6 2 Divisions of the Nervous System Peripheral Nervous System(PNS)Central Nervous System(CNS)nerves extending throughout bodyGathers & delivers info to and from the CNSbrain & spinal cordMain control center of body
7 Peripheral Nervous System (PNS) All of the Organs the PNS controls!!!
8 The Neuron (Nerve Cell) Neurons carry messages called impulses back and forth between theperipheral nervous system and thecentral nervous system.
9 Impulse in a Neuron signal direction ONE WAY dendrites nucleus terminalbranchessignal directionONE WAYcell bodysynapse(space)axon
11 Axon is coated with insulation made of myelin cells (Lipids) signaldirectionWith myelin…signal hops from node to node at 330mph! (vs. only 11mph)Multiple Sclerosisimmune system attacks myelin coatingloss of signalmyelin coating
12 Because neurons never touch, chemical signalers called neurotransmitters must travel through the space called synapse between two neurons.synapse
13 The message is transferred when RECEPTORS receive neurotransmitters. Synapse (gap)
14 Receptors: Protein Shape Specific! Drugs/Poisons Stimulants - Speed up production and release of neurotransmitters (Caffeine)Depressants – block formation of neurotransmitters. (Pain Killers)
27 A reflex is an involuntary response that is processed in the spinal cord not the brain. Reflexes protect the body before the brain knows what is going on.*faster because they don’t have to travel to brain!Reflex Arc
29 The Brain: Where do the impulses go??? Spinal CordCerebellumCerebrumMedulla Oblongata
30 Brain - Receives 20% of blood pumped by heart - Is the major user of glucose in the bodyWhat does the brain use glucose for?Consists of 3 Parts:CerebrumCerebellumMedulla (Brain Stem)
31 Higher Brain: Cerebrum 2 hemispheres:left controls the right side of bodyright controls the left side of body
32 Cerebrum Functions Regions specialized for different functions 4 Lobes 1. frontalspeech, control of emotions2. temporalsmell, hearing3. occipitalvision4. parietalspeech, taste readingfrontalparietaltemporaloccipital
33 Cerebellum Found in back part of head under the cerebrum coordination of smooth, steady and efficient MOVEMENTBALANCE, equilibrium and postureIf damaged can result in jerky movement, loss of coordination and balance
34 Brain Stem (Medulla) Medulla Oblongata basic body functions breathingheartbeatdigestionswallowingvomitingcoughingblinkingHOMEOSTASIS
36 CNS Protection Bone: Skull, Vertebrae Cartilage disks found between vertebrateabsorb shockMeninges (protective membrane) cover the brain and spinal cordCerebral Spinal Fluid surrounds Brain and Spinal Cord. Acts like a watery cushion!
38 Cerebral Palsy: A group of birth disorders characterized by disturbances of motor functions.
39 Polio: A viral disease of the CNS that can cause paralysis. Prevented by immunization!
40 Meningitis – an inflammation, caused by bacteria, of the membranes that surround the brain and spinal cord. Can be fatal.Symptoms: severe headache, stiff neck
41 Concussion:The Brain is a soft organprotected by your hard skullsurrounded by spinal fluid (cushion that keeps your brain from banging into your skull)Hard hit/fall=Brain crashes into your skull=Damaged Brain