3 What are the functions of the nervous system? The main functions of nervous system are communication and coordination of body activities. This is done by transmitting signals between the brain and the rest of body.
4 Q: What are the functions of the nervous system? Collect information about the body’s environmentInternally and externallyProcess the informationCreate a responseThe brain or spinal cord createsand sends a response to the body
5 There are two functioning parts of the nervous system: 1. Central Nervous SystemBrain and spinal cordProcesses information and creates response2. Peripheral Nervous SystemNerves that connect the body to the centralnervous system. They carry signals betweenthe central nervous system and body.
6 Central vs. Peripheral Nervous System Talk about searching for a pencil in your backpack
7 Peripheral Nervous System Consists of different types of cells;Nerves that carry information from the sensory organs, ( skin, ear, eye, tongue, nose),Nerves that control the voluntary muscles,Nerves that regulate involuntary functions such as breathing, digestion, and heartbeat.
8 Nerves are made of bundles of neurons , each surrounded by connective tissue.
9 Central Nervous System Protection Skull protects the brain.Spine protects the spinal cord.Cerebrospinal fluid surrounds and cushions the brain and the spinal cord. It transports chemicals and removes waste from the central nervous system.
10 Which diagram is showing the nervous system? Castlelearning.com
11 Nerve tissue It is mainly made up of neurons. Is found in the brain, the spinal cord and in the nerves.It is mainly made up of neurons.
12 How is the information collected by the nervous system carried through the body? Messages carrying information through the nervous system are ELECTRICAL SIGNALS called IMPULSESNEURONS are cells that carry and pass along these signalsNeurons are the main cells of the nervous system“The functional units of the nervous system”drbasmamoussa.wordpress.com
13 Structure of Neuron Cell Body – contains nucleus and much of cytoplasm Dendrites – receive impulses (messages) from other neuronsAxon – long fiber carrying impulses away to the next neuronbiologysnippets.blogspot.com
14 Quick Check… What are each letters? Are there more dendrites or axons in a neuron?
15 How do electrical cords ensure the electricity stays within the wire?
16 Lets make sure the message doesn’t get lost… The axon is surrounded by a MYELIN SHEATHKeeps electric signal within the axonCauses the signal to move fasterbiologysnippets.blogspot.comhealth.allrefer.com
17 Repair of NeuronsInjured neurons in the central nervous system don’t regenerate easily.Some neurons in peripheral nervous system can regrow and repair a small gap.
18 Start an impulse Stimuli cause electric signals A stimulus is a detectablechange in the environment.Impulses begin when neuronsAre stimulated by another neuron orby the environment.
19 Sensory ReceptorsSensory receptors are structures in the skin and other tissues that detect changes in the internal or external environment. These receptors consist of specialized neuron endings or specialized cells in close contact with neurons that convert the energy of the stimulus (sound, color, odor, etc.) to electrical signals within the nervous system. Sensory receptors, together with other cells, compose the major sense organs, including eyes, ears, nose, and taste buds. Information from different sensory receptors go to specific parts of the brain.
21 Read 3.10Bionic Arm, Diseases and disordersH.W. page 107 #1-7
22 How are messages passed between neurons and other cells? The space between two neurons is called a SYNAPSErhsmpsychology.com
23 Moving the signal between cells Once the signal reaches the end of the axon:NEUROTRANSMITTERS are released into the synapseThe neurotransmitters travel across synapse and bind to CELL RECEPTORS (shape!!) on the next neuronThe target cell takes message from receptors and continues moving the signal
24 Regents ReviewThe diagram represents the functional unit of a nervous system. Which structure secretes a neurotransmitter? Which structure contains cell receptors that bind neurotransmitters?structure Astructure Bstructure Cstructure D