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Ch 21 Nervous System

Neurons are highly specialized cells comprising a cell body, dendrites, and an axon. Dendrites receive impulses, while axons carry these impulses to synapses, the spaces between neurons where neurotransmitters are released. The Central Nervous System (CNS) and Peripheral Nervous System (PNS) work together to transmit signals, from sensory receptors through sensory neurons to the CNS for interpretation, and then back to the PNS via motor neurons for a response. Explore this intricate neural communication system.

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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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