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29.2 Neurons Ch. 29.2 page 876 • 1st Define the vocabulary terms for this section. • 2nd Notes • 3rd-Activity 29.2 Neurons • Subject- Test The Nervous System • Date-May 2, 2012 • I am going to help with the diagram 29.2 Neurons KEY CONCEPT The nervous system is composed of highly specialized cells. 29.2 Neurons Neurons are highly specialized cells. • A neuron has six parts. – cell body has nucleus and organelles 1 Cell body 29.2 Neurons Neurons are highly specialized cells. • A neuron has six parts. – cell body has nucleus and organelles – dendrites receive impulses 2 dendrites 29.2 Neurons Neurons are highly specialized cells. • A neuron has three parts. – cell body has nucleus and organelles – dendrites receive impulses – axon carries impulses 3 axon 29.2 Neurons • Neurons have other structures to transmit signals. – Schwann cell 29.2 Neurons • Neurons have other structures to transmit signals. – Schwann cell-makes up the myelin sheath-insulates axons synapse 29.2 Neurons • Neurons have other structures to transmit signals. – Synapse-gap between terminal end and next neuron – terminal-releases vesicles that contain neurotransmitters axon terminal 29.2 Neurons Neurons receive and transmit signals. • Resting potential means no signal is being transmitted. – more Na+ outside of cell – more K+ inside of cell 29.2 Neurons • 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 29.2 Neurons • A chemical signal passes between neurons. – Impulse reaches terminal. impulse 29.2 Neurons • A chemical signal passes between neurons. – Impulse reaches terminal. impulse 29.2 Neurons • Neurotransmitters- Chemical signals that pass between neurons. – Impulse reaches terminal. – Neurotransmitters released into synapse. --Bind to receptors on the next neuron and stimulate the next action potential, synapse impulse neurotransmitter vesicles receptor 29.2 Neurons • A chemical signal passes between neurons. – Impulse reaches terminal. – Neurotransmitters released into synapse. synapse impulse neurotransmitter vesicles receptor 29.2 Neurons
