Presentation on theme: "Nervous System and Neurons"— Presentation transcript:
1 29.1-2 Nervous System and Neurons Set up Cornell Notes on pg. 31Topic: 29.2 Nervous System and NeuronsEssential Question(s):Draw and label a neuron on pg. 46 in picture bubble map format.Nervous System and Neurons2.1 Atoms, Ions, and MoleculesKEY CONCEPTThe nervous system provides the means by which organ systems communicate and is composed of highly specialized cells.
2 KEY CONCEPT The nervous system provides one of the means by which organ systems communicate.
3 The nervous system controls thoughts, movement, and emotion as well as simpler life processes such as swallowing
4 interconnected network of cells (hardwired) The nervous system works quickly, using chemical and electrical signals.interconnected network of cells (hardwired)signals move through cells (neurons)divided into central nervous system (CNS) and peripheral nervous system (PNS)CNS- brain and spinal cordPNS-network of nerves that transmit messages to and from the PNS to the CNSspinal chordnerves
5 KEY CONCEPT The nervous system is composed of highly specialized cells.
6 Make up an information network (Like the internet) Neurons (aka nerve cells) are cells that can store information and send and receive messages within the nervous system.Make up an information network (Like the internet)Cell bodyaxonneurotransmitterDendrites
8 Neurons are highly specialized cells. A neuron has three parts.1. cell body has nucleus and organelles1Cell body
9 Neurons are highly specialized cells. A neuron has three parts.1. cell body has nucleus and organelles2. dendrites receive messages from neighboring cells2dendrites
10 Neurons are highly specialized cells. A neuron has three parts.1. cell body has nucleus and organelles2. dendrites receive messages from neighboring cells3. axon carries messages to other cellsSpecialized support cells- such as the myelin sheath- insulate neurons’ axons and helps them send messages3axon
11 Directions: Please make a picture bubble map of this neuron. Use p Directions: Please make a picture bubble map of this neuron. Use p in your book to help you. Label all major parts of a neuron (cell body, dendrites, axon, myelin sheath, axon terminals, action potential, synapse, neurotransmitters). Once all parts are labeled, you need to describe the function of each.
24 Axon terminal: releases neurotransmitters (chemical signals) Synapse (gap)Axon terminalDendrites of next neuron
25 NEURON Check your labels: Neurotransmitters Synapse Cell body axon Myelin sheathDendritesAxon terminalAction potential
26 Neurons transmit information in the form of electrical and chemical impulses When a neuron is stimulated, it produces an electrical signal (action potential) within that neuronElectrical Impulse reaches axon terminal
27 3. Neurotransmitters (chemicals) release into synapse. 2. Before it can move to the next cell it changes into a chemical signal (neurotransmitter)3. Neurotransmitters (chemicals) release into synapse.4. Neurotransmitters stimulate next cell.synapseneurotransmittervesiclesreceptor
29 How does the structure of a neuron make it effective in carrying out the functions of the nervous system?
30 How does the structure of a neuron make it effective in carrying out the functions of the nervous system?Neurons have long extensions called axons, which allow messages to be carried long distances without having to pass the signal to another cell.
31 Set up Cornell Notes on pg. 33 Topic: 29.2 Types of NeuronsEssential Question(s):None.29.2 Types of Neurons2.1 Atoms, Ions, and Molecules
33 There are 3 types of neurons: Sensory neuronsInterneuronsMotor neurons
34 1. Sensory Neurons: (Think Senses) Function: Sensory receptors gather information from external/ internal environment and carry impulses along sensory neurons to the CNSNO INTERPRETATIONLocated in PNSOutside:Light&SoundIntensitiesInside:TemperatureOxygen LevelspH Levels
35 2)Interneurons:Function: Receives signals from sensory neurons and processes and interprets these messages within the CNSMakes decisions on what needs to be doneSends messages/instructions to motor neuronsLocated in CNS
36 3)Motor neurons:Function: Carry nerve impulses out of the brain or spinal cord to effectorsEffectors: muscles and glands will execute a specific taskLocated in the PNS.
42 In a nutshell…. The nervous system can: Detect changes in the body Make decisions based on the info receivedStimulate muscles and/or glands to respondCounteract changes to maintain homeostasis
43 Types of Neurons “Story” Tree Map (P. 32) Sensory Neurons Interneurons Motor NeuronsFunctionLocationFunctionLocationFunctionLocationGive a real life example (Tell a story)Draw a picture for each1. The phone rings. The sensory neurons in your ear gather the sound information and send it to the CNS2. Your brain interprets this information and identifies the sound as the phone ringing. This info is sent to the motor neurons3. The motor neurons send nerve impulses to your muscles which allow you to answer the phone