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Ch. 29.2 page 876

Ch. 29.2 page 876. 1 st Define the vocabulary terms for this section. 2 nd Notes 3 rd -Activity. Subject- Test The Nervous System Date-May 2, 2012 I am going to help with the diagram. KEY CONCEPT The nervous system is composed of highly specialized cells. 1. Cell body.

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Ch. 29.2 page 876

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  1. Ch. 29.2 page 876 • 1st Define the vocabulary terms for this section. • 2nd Notes • 3rd-Activity

  2. Subject- Test The Nervous System • Date-May 2, 2012 • I am going to help with the diagram

  3. KEY CONCEPT The nervous system is composed of highly specialized cells.

  4. 1 Cell body Neurons are highly specialized cells. • A neuron has six parts. • cell body has nucleus and organelles

  5. 2 dendrites Neurons are highly specialized cells. • A neuron has six parts. • cell body has nucleus and organelles • dendrites receive impulses

  6. 3 axon Neurons are highly specialized cells. • A neuron has three parts. • cell body has nucleus and organelles • dendrites receive impulses • axon carries impulses

  7. Neurons have other structures to transmit signals. • Schwann cell

  8. synapse • Neurons have other structures to transmit signals. • Schwann cell-makes up the myelin sheath-insulates axons

  9. axon terminal • Neurons have other structures to transmit signals. • Synapse-gap between terminal end and next neuron • terminal-releases vesicles that contain neurotransmitters

  10. Neurons receive and transmit signals. • Resting potential means no signal is being transmitted. • more Na+ outside of cell • more K+ inside of cell

  11. area of detail • An action potential is a moving electrical impulse. • It is generated by a stimulus. • Na+ enters, and cell becomes positively charged. • K+ leaves, and area of positive charge moves.

  12. A chemical signal passes between neurons. • Impulse reaches terminal. impulse

  13. A chemical signal passes between neurons. • Impulse reaches terminal. impulse

  14. synapse receptor neurotransmitter vesicles • Neurotransmitters- Chemical signals that pass between neurons. • Impulse reaches terminal. • Neurotransmitters released into synapse. • --Bind to receptors on the next neuron and stimulate the next action potential, impulse

  15. synapse receptor neurotransmitter vesicles • A chemical signal passes between neurons. • Impulse reaches terminal. • Neurotransmitters released into synapse. impulse

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