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Senses lab: Smells

Senses lab: Smells. Mouthwash Tropical punch Water Honey Soap Ketchup. Rock Shoestring Lock Plastic knife Metal clip. Baseball Rubber ball Nut Wooden spool clothes pin. Senses Lab: Touch. Nervous System Part 2. Neurons. Cerebrum. 1. Parts of the Nervous System.

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Senses lab: Smells

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  1. Senses lab: Smells • Mouthwash • Tropical punch • Water • Honey • Soap • Ketchup

  2. Rock Shoestring Lock Plastic knife Metal clip Baseball Rubber ball Nut Wooden spool clothes pin Senses Lab: Touch

  3. Nervous System Part 2 Neurons

  4. Cerebrum

  5. 1. Parts of the Nervous System • Central Nervous System- brain and spinal cord • Anatomy of the brain • Cerebrum-voluntary activity, movement, learning, judgment • Cerebellum- balance, coordination • Brain stem- (medulla oblongata) blood pressure, heart rate, breathing

  6. Function of neurons • Neurons are part of the peripheral nervous system. • They carry impulses (signals, messages) through the nervous system

  7. 2. Types of neurons • Sensory neurons (body to brain) • Interneurons (within brain & spinal cord) • Motor neurons (brain to body)

  8. 3. Anatomy of a neuron Direction of Signal

  9. 4. Neuron Structure • Dendrites- receive impulse and send it to cell body • Cell body- contains nucleus, ribosomes, etc. • Axon- carries impulse away from cell body to next neuron, muscle, or organ. 1. Myelin- fatty coating insulates axon

  10. 5. Connections between neurons • Axons and dendrites do not touch • Synapse/synaptic cleft- space between • Neurotransmitters- chemicals that go from axon to dendrite across synapse.

  11. Pneumonic Device: D C A S N

  12. Pneumonic Device: D ead C ats A lways S mell N asty D racula C an A lways S uck N ecks D rugs C an’t A lways S atisfy N ikki

  13. HW: Write a story about someone who takes in sensory information, makes a decision, and responds. Be sure to include all 3 kinds of neurons as well as the parts of the brain that are involved. Include: brain stem interneuron cerebrum sensory neuron cerebellum motor neuron

  14. Homework • Page 900: 1-4

  15. Cell membrane- Remember?

  16. 6. Neuron at rest • Inside is negative, outside is positive. • Na+/K+ pump moves ions across the membrane: K+ in, Na+ out • It is “polarized.” + + + + + + + + + + - - - - - - - -- - - - - - - - - -

  17. 7. Relaying a signal within a neuron- nerve impulse • Neuron at rest • When impulse is received, Na+ channels open. • Na+ flows into cell making it more positive inside and negative outside (depolarized).

  18. This passes like a wave through the cell. • Na+ channels close, K+ open, repolarize the cell. • The cell returns to resting state.

  19. Homework: • Draw the following in your notes: Fig 35-6 (p. 898) and Fig 35-7 (p. 899)

  20. Nerve Impulse Movie

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