Download
welcome it is a great day to learn about the brain n.
Skip this Video
Loading SlideShow in 5 Seconds..
Welcome it is a great day to learn about the Brain PowerPoint Presentation
Download Presentation
Welcome it is a great day to learn about the Brain

Welcome it is a great day to learn about the Brain

116 Views Download Presentation
Download Presentation

Welcome it is a great day to learn about the Brain

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Welcome it is a great day to learn about the Brain

  2. What does the Brain do? • Jot down EVERYTHING your brain does • Okay list about 10 things

  3. We are going to start small and go big

  4. Neurons: The Building Blocks of the Nervous System

  5. Nervous System • The electrochemical communication system of the body • Sends messages from the brain to the body for movement • Brings information to the brain from the senses

  6. Neuron • The basic building block of the nervous system -- a nerve cell • Neurons perform three basic tasks • Receive information • Carry the information • Pass the information on to the next neuron

  7. Types of Neurons Sensory Motor Interneuron's

  8. Sensory Neurons • INPUT Fromsensory organs to the brain and spinal cord Brain Drawing shows a somatic neuron Sensory Neuron Spinal Cord

  9. Brain Sensory Neuron Spinal Cord Motor Neuron Motor Neurons • OUTPUTFrom the brain and spinal cord to the muscles and glands

  10. Brain Sensory Neuron Spinal Cord Motor Neuron Interneuron's • Interneurons carry information between other neurons only found in the brain and spinal cord

  11. The Basic Parts of a Neuron

  12. What are the primary parts of a typical neuron? • Nervous system • Neurons • Dendrites • Soma • Axon • Terminal branches of Axon • Myelin Sheath

  13. The Basic Parts of a Neuron

  14. Parts of the Neuron

  15. A. Dendrites • Thin, branching fibers lined with receptors at which the dendrite receives information from other neurons.

  16. Parts of the Neuron - Dendrites

  17. B. Cell Body/Soma • Contains the nucleus and other parts of the cell needed to sustain life

  18. Parts of the Neuron - Soma

  19. C. Axon • Carries the message across the neuron

  20. Parts of the Neuron - Axon

  21. D. Myelin Sheath • An insulating, fatty covering around the axon that speeds neural transmissions. Axons that are myelinated appear white. Known as “white matter.”

  22. Parts of the Neuron – Myelin Sheath

  23. E. Axon Terminal Buttons • The branched end of the axon that contains neurotransmitters

  24. Parts of the Neuron - Terminals

  25. Time to Move • Locate the person furthest from you • Go to that person • Introduce yourself

  26. Pick an A and D A = Axon D= Dendrite With your partner explain the relationship between neurons

  27. Neuron

  28. Neuron

  29. Neural Transmission

  30. Neural Communication: The Neural Impulse

  31. Action Potential • A brief electrical charge that travels down the axon of the neuron. • A neural impulse • Considered an “on” condition of the neuron

  32. Refractory Period • The “recharging phase” when a neuron, after firing, cannot generate another action potential • Once the refractory period is complete the neuron can fire again

  33. Resting Potential • The state of a neuron when it is at rest and capable of generating an action potential • The neuron is set and ready to fire

  34. Neuron firing like a Toilet • Like a Neuron, a toilet has an action potential. When you flush, an “impulse” is sent down the sewer pipe

  35. Neuron firing like a Toilet 2. Like a neuron, a toilet has a refractory period. There is a short delay after flushing when the toilet cannot be flushed again because the tank is being refilled

  36. Neuron firing like a Toilet • Like a Neuron, a toilet has a resting potential. The toilet is “charged” when there is water in the tank and it is capable of being flushed again • Like a Neuron, a toilet operates on the all-or-none principle – it always flushes with the same intensity, no matter how much force you apply to the handle

  37. All-or-None Principle • 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.

  38. Communication Between Neurons Module 7: Neural and Hormonal Systems

  39. Synapse • The space between the terminal buttons on one neuron and dendrites of the next neuron

  40. Neurotransmitters • Chemicals contained in the terminal buttons that enable neurons to communicate. Neurotransmitters fit into receptor sites on the dendrites of neurons like a key fits into a lock.

  41. Neurotransmitters

  42. Neurotransmitters • A chemical messenger that travels across the synapse from one neuron to the next • Can influence whether the second neuron will generate an action potential or not