Presentation on theme: "Movie: Nervous System (27:00min)"— Presentation transcript:
1 Movie: Nervous System (27:00min) The Nervous SystemMovie: Nervous System(27:00min)
2 The Nervous System The body’s command system. Functions: Communicates information throughout the body and controls the body’s response to stimuli.Stimuli – any change that happens inside the body or in the surrounding environment.Functions:Takes in and processes information about the environment.Coordinates the actions of the body’s skeletal muscles.Allows communicationRegulates all activities the body can perform.
3 Organization of the Nervous System Made up of nervous tissueMain organs:BrainSpinal cordSensory organs; eyes, ears, nose, tongue, and skinHas two divisions:Central nervous system (CNS)Peripheral nervous system (PNS)
4 Nervous Tissue Made up of cells called Neurons Message carrying cells DendritesCell BodyNucleusAxonAxonTerminalsSynapse
5 Characteristics of a Neuron Neurons can NEVER be replaced!Parts of the Neuron:DendritesCarry impulses toward the cell bodyCell bodyContains the nucleusControls all the activities of the cellAxonCarry impulses away from the cell bodyAxon TerminalEnds of an axonPass a message on to the neighboring neuron’s dendritesSynapseSpace separating the axon terminal of one neuron and the dendrites of the neighboring neurons.
6 Nerve ImpulseThe message being carried throughout the body by nerves - Nerve Impulse.ONLY travesl in one directionTravels as fast as 120 m/secCarried as both electrical and chemical messagesMessages come in from different stimuli and trigger electrical impulsesAt the end of the axon it is changed into a chemical message so it can cross over the synapse – neurotransmitters.
7 Nerve Impulse Synapse Dendrites Cell Body Nucleus Axon Axon Terminals Come in aselectrical signalsChanged toChemical SignalsDendritesCell BodyNucleusAxonAxonTerminalsSynapse
8 Types of Neurons 3 Types of Neurons: Sensory Neuron – picks up stimuli from the internal and external environments.Location where the stimuli is received - Receptor.Interneurons – carry nerve impulses from one neuron to another.Brain interprets the message and determines appropriate reaction.Motor Neuron – Send an impulse to the muscle resulting in a response to the stimuli.Muscle tissue responds to the impulse - Effector
9 1____ Receptors in your ear hear the phone. ____ Receptors trigger nerve impulses in sensory neurons. ____ Nerve impulses pass to interneurons in the brain. ____ Your brain interprets the impulses from many interneurons and you realize the phone is ringing. Your brain also decides that you should answer the phone. ____ Impulses travel along motor neurons to the muscles. ____ Muscles in the arm carry out the response and you reach to pick up the phone - effector.23456
10 Central Nervous System (CNS) BrainMade up of the brain and spinal cord.Forms the largest part of the nervous system.Responsible for communication, memory and thought.SpinalCord
11 Peripheral Nervous System (PNS) Connects the brain and spinal cord to the rest of the body.Made up of:12 pairs of cranial nerves31 pairs of spinal nerves2 divisions:SomaticControls voluntary actionsjoggingAutonomicControls involuntary actionsBreathing & digestionSpinalNerves