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Neurons are highly specialized cells.

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Presentation on theme: "Neurons are highly specialized cells."— Presentation transcript:

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

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

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

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

5 Neurons have other structures to transmit signals.
Schwann cell

6 Neurons have other structures to transmit signals.
Schwann cell synapse synapse

7 Neurons have other structures to transmit signals.
Schwann cell synapse terminal axon terminal

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

9 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. area of detail

10 A chemical signal passes between neurons.
Impulse reaches terminal. impulse

11 A chemical signal passes between neurons.
Impulse reaches terminal. impulse

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

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

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