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Do Now: Receive New Packet And Put Your Name On It

Do Now: Receive New Packet And Put Your Name On It. HAPPY. April 25, 2014.

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Do Now: Receive New Packet And Put Your Name On It

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  1. Do Now: Receive New Packet And Put Your Name On It

  2. HAPPY April 25, 2014 DNA Day is a holiday celebrated on April 25. It commemorates the day in 1953 when James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin and colleagues published papers in the journal Nature on the structure of DNA.

  3. What did you learn in last night's reading?

  4. The Nervous System Chapter 31 Get it?!? He’s NERVOUS!!! lol

  5. The main functional unit of the nervous system are neurons. • Neuron – cell that carries messages throughout the nervous system • Impulse – electrical signal carried by neurons in the nervous system

  6. Parts of the Neuron • Cell Body (Soma) – largest part of a typical neuron; contains the nucleus and much of the cytoplasm

  7. Parts of the Neuron • Dendrites – extension of the cell body of a neuron that carries impulses from the environment or from other neurons toward the cell body

  8. Parts of the Neuron • Axon - long fiber that carries impulses away from the cell body of a neuron

  9. Parts of the Neuron • Schwann Cells – cells that grow around an axon and wrap it in layers of their own cell membrane

  10. What else did you do, Teddy? • I discovered and studied pepsin, a stomach enzyme that digests proteins • I invented the term, metabolism • I came up with part of the cell theory

  11. Parts of the Neuron • Myelin Sheath– insulating membrane surrounding the axon in some neurons

  12. Parts of the Neuron • Nodes of Ranvier– gaps in the axon where there is no myelin sheath

  13. What else did you do, Louis-Antoine? • I wrote a textbook on histopathology • I also discovered melanocyte-like cells in the skin

  14. Parts of the Neuron • Axon terminal– the end of an axon

  15. Parts of the Neuron • Axon hillock– where the axon attaches to the cell body

  16. Page 2

  17. Fill in the Blanks • Stimuli are detected at _________________, then the _________________ performs most metabolic activity to keep the cell alive. It also collects the information from the dendrites and generates an impulse which is carried away from the _________________ on the _________________ to the next _________________.

  18. Fill in the Blanks • In most cases, nerve cells exist in bundles called _________________ . One _________________ may have hundreds or thousands of nerve cells (aka _________________ ).

  19. Fill in the Blanks • Nerve cells must be insulated to protect these very slight charge differences as well as protecting other cells surrounding the neuron. _________________ surround the axon and produce a substance called _________________ which insulates and protects.

  20. Fill in the Blanks • The place where two cells meet is actually a thin spot where the _________________ is essentially “naked.” These spots are called _________________ .

  21. Three types of nerve cells: • Sensory – carries impulses from sense organs to the brain and the spinal cord • Motor – carries sense impulses from the brain or spinal cord to muscles or other organs • Interneurons – connects sensory and motor neurons and carries impulses between them

  22. Do Now: Page 11 • HOMEWORK: • Page 900, 1 – 4

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