The parts and functions

 Have you ever played the game telephone?  Ideally what would be the outcome?  What are the components involved in the game?  Is this similar to neuron communitcation

 Review of readings  Organizer  Recap of thoughts  Lecture  Motor Neurons  Sensory Neurons  Action Potential ▪ 3 phases ▪ All or none  Group Activity  Homework assigment  Key terms: ▪ Axon ▪ Axon Terminals ▪ Dendrite ▪ Soma/Cell Body ▪ Nucleus ▪ Synapse ▪ Myelin Sheath

Building blocks of the brain 100 billion neurons 30,000 on a pinhead Neurons are the building blocks of your brain. They communicate with each other thousands of times a second.

Neurons Many types and shapes Webs of connections make the brain work The connections among the neurons in all the different brain parts is what makes your brain work.

 Dendrites: receive messages  The dendrites receive messages from other neurons.

 Soma: body of the cell  Dendrites: receive messages  Axon: sends messages

 Soma: body of the cell  The cell body, or soma, is a neuron's main cellular space. The soma houses the nucleus, in which the neuron's main genetic information can be found.

 Axon: sends messages  The axon sends messages to other neurons.

Myelin

 5uc 5uc

 When a nerve impulse arrives at the end of an axon, neurotransmitters are released, diffusing across a tiny gap to the next neuron. Here they bind to receptors - proteins on the surface of the cell - as a key fits into a lock. On delivery of their 'messages' these chemical couriers are destroyed or reabsorbed by the nerve endings in which they were produced.

 The principle that if a neuron fires it will always fire at the same intensity  All action potentials are of the same strength.  A neuron does NOT fire at 30%, 45% or 90% but at 100% each time it fires.

 What neurotransmitters do Neurotransmitters are central to memory, learning, mood, behavior, sleep, pain perception and sexual urge. They operate at the junctions between neurons, allowing communication between cells.

 In groups, quickly decide who will be responsible for the following: ▪ Drawing ▪ Labeling ▪ Explaining  Keep in mind that you will be in the same groups on Monday and will have to be responsible for a different task  Directions:  On a piece of poster board draw a neuron complete with a synapse  After the drawing is complete label the parts, functions, and direction of travel for an action potential  Once the drawing is complete please explain it to Ms. Roethler or Mr. Neuzil

 Please read the articles provided in their entirety  On the sheet provided, please in a short paragraph explain the function and role of your specifically assigned neurotransmitter  This is due Monday October 26 at the beginning of class