Presentation on theme: "DO NOW: What is the function of the nervous system"— Presentation transcript:
1AIM: How does the Nervous System work and how does it help the body maintain homeostasis? DO NOW: What is the function of the nervous system? What are the three types of neurons? What are their functions?Nervous System Vocabulary: neuron, cell body (soma), axon, dendrites, myelin sheath, synapse, neurotransmitter, receptor, central nervous system, peripheral nervous system, stimulus, impulse, regulation, effector, action potential, membrane (resting) potential, depolarizationHave out HW for me to checkResults and Discussion section due via turnitin.com on 12/23 (extended)HW due Tuesday pg 900 questions 1-5 and pg 905 ques 5Exam on Wednesday circulation, respiration and the nervous system
2Function of the Nervous System Process InformationStores InformationControls Voluntary movementsControls Involuntary process and actionsStimulus Vs Response
3Parts of the Nervous System Central Nervous SystemBrainSpinal CordPeripheral Nervous SystemAutonomic Nervous SystemSomatic Nervous System
4What is Regulation? Control and coordination of all life functions 2 systems involvedStimulus: change or activity in the environment that causes a change in the organism; physical, chemicalReceptorsResponse: action or movement resulting from a stimulusEffectorsImpulses: electrical messages sent over a nerve cell (neuron)
5Aim: How is an action potential propagated in the nervous system? Do Now: What is the central nervous system? Distinguish between sensory, motor and interneuronsResults and Discussion section due via turnitin.com on 12/23 (extended)HW due Tomorrow pg 900 questions 1-5 and pg 905 ques 5Exam on Wednesday circulation, respiration and the nervous system
6Review of Do Now Central Nervous System Sensory Neurons Motor Neurons Brain and spinal cordSensory NeuronsCarry signals betewen the central nervous system and a sense organ.Motor NeuronsCarry signals between the central nervous system and a muscleInterneuronsCarry signals between sensory and motor neuronsDemyelination
7NeuronSketch the diagram of a neuron below, and label each part AND its function.(See page 897)What would you expect to happen if a person had a disease in which the myelin sheath is destroyed?Sensory, motor, interneuronsAxon terminalsMyelin sheathNodesCell bodyAxonNucleusDendrites
8Membrane PotentialDescribe the difference in charge between the inside and outside of the nerve cell (a).How is this difference maintained? Explain based on the picture above (b). Be specific!
9Follow-up QuestionsWhy is it impossible for ions to travel across the membrane by simple diffusion? How do ions travel across the cell membrane (two ways)?What do you think would happen if the sodium channels in a nerve cell were suddenly opened? The potassium channels?What effect would each of these events have on the membrane potential?
10Aim: How is an action potential propagated in a neuron Do Now: How does an influx of Na+ change the membrane potential? What about an influx of K+?Have out HWTest on Thursday
11The Action PotentialAim: How is an action potential propagated in the nervous system?
13Review QuestionsHow does an action potential stop, i.e., how does a nerve cell return to its resting (membrane) potential?Why is an action potential an all or none event?If action potentials are all or none events, how does the nervous system distinguish between strong and weak stimuli?
14The Action PotentialResting potential established by Sodium Potassium pumpSodium-potassium pump(3 Na+ out, 2 K+ in)Stimulation: Channels open Na+ in and K+ outThresholdReversal of chargesAll or none eventLike the Domino effect
15Dendrite of adjacent neuron The SynapseDirection of ImpulseDendrite of adjacent neuron-Junction between axon of one neuron and dendrites of another-Neuron can transfer an impulse to another cellHow would abnormal levels of neurotransmitters affect the function of the nervous system?AxonReceptorVesicleElectrical vs. Chemical SignalingAxon terminalSynaptic cleftNeurotransmitter
16Questions For ReviewHow does the nervous system couple electrical and chemical signaling? What events take place at the junction between two neurons?What is an action potential?Define depolarization.How does a neuron distinguish between a strong stimulus and a really strong stimulus?What is a synapse? What type of signaling takes place at the synapse?