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Ch 21 Nervous System

Ch 21 Nervous System. 1. Cell body. Neurons are highly specialized cells. A neuron has three parts. cell body has nucleus and organelles. 2. dendrites. Neurons are highly specialized cells. A neuron has three parts. cell body has nucleus and organelles. dendrites receive impulses. 3.

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Ch 21 Nervous System

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  1. Ch 21 Nervous System

  2. 1 Cell body Neurons are highly specialized cells. • A neuron has three parts. • cell body has nucleus and organelles

  3. 2 dendrites Neurons are highly specialized cells. • A neuron has three parts. • cell body has nucleus and organelles • dendrites receive impulses

  4. 3 axon Neurons are highly specialized cells. • A neuron has three parts. • cell body has nucleus and organelles • dendrites receive impulses • axon carries impulses

  5. synapse • Synapse is the space between two neurons • Neurons have other structures to transmit signals.

  6. axon terminal • synapse • Neurons have other structures to transmit signals. • terminal

  7. Impulse reaches terminal. • A chemical signal passes between neurons. • Neurotransmitters released into synapse. impulse

  8. synapse receptor neurotransmitter vesicles • Impulse reaches terminal. • Neurotransmitters released into synapse. • A chemical signal passes between neurons. • Neurotransmitters stimulate next cell. impulse

  9. The CNS and PNS pass signals between one another. • Sensory receptor generates impulse. • Impulse travels on sensory neurons • PNS passes impulse to CNS. • CNS interprets impulse. • CNS passes impulse to PNS. • PNS motor neurons stimulate a response.

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