1. 29.2 Neurons Ch. 29.2 page 876 1 st Define the vocabulary terms for this section. 2 nd Notes 3 rd -Activity

2. 29.2 Neurons Subject- Test The Nervous System Date-May 2, 2012 I am going to help with the diagram

3. 29.2 Neurons KEY CONCEPT The nervous system is composed of highly specialized cells.

4. 29.2 Neurons Neurons are highly specialized cells. A neuron has six parts. –cell body has nucleus and organelles 1 Cell body

5. 29.2 Neurons –dendrites receive impulses Neurons are highly specialized cells. A neuron has six parts. –cell body has nucleus and organelles 2 dendrites

6. 29.2 Neurons –axon carries impulses 3 axon –dendrites receive impulses Neurons are highly specialized cells. A neuron has three parts. –cell body has nucleus and organelles

7. 29.2 Neurons Neurons have other structures to transmit signals. –Schwann cell

8. 29.2 Neurons synapse Neurons have other structures to transmit signals. –Schwann cell-makes up the myelin sheath-insulates axons

9. 29.2 Neurons –terminal-releases vesicles that contain neurotransmitters –Synapse-gap between terminal end and next neuron Neurons have other structures to transmit signals. axon terminal

10. 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

11. 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

12. 29.2 Neurons A chemical signal passes between neurons. –Impulse reaches terminal. impulse

13. 29.2 Neurons A chemical signal passes between neurons. –Impulse reaches terminal. impulse

14. 29.2 Neurons Neurotransmitters- Chemical signals that pass between neurons. –Impulse reaches terminal. –Neurotransmitters released into synapse. impulse synapse receptor vesicles neurotransmitter --Bind to receptors on the next neuron and stimulate the next action potential,

15. 29.2 Neurons A chemical signal passes between neurons. –Impulse reaches terminal. synapse receptor vesicles impulse neurotransmitter –Neurotransmitters released into synapse.

16. 29.2 Neurons