Neurons are highly specialized cells.

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29.2 Nervous System and Neurons

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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---has myelin sheath on outside 4

Neurons have other structures to transmit signals. Synapse-area b/n 2 neurons 5 synapse 6 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 Cell is negatively charged

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. Neurotransmitters stimulate next cell. synapse impulse neurotransmitter vesicles receptor