Neurons are highly specialized cells.

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Presentation transcript:

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

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

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

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

Neurons have other structures to transmit signals. Schwann cell

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

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

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

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

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

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

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

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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