29.2 Neurons Ch page st Define the vocabulary terms for this section. 2 nd Notes 3 rd -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 –dendrites receive impulses Neurons are highly specialized cells. A neuron has six parts. –cell body has nucleus and organelles 2 dendrites

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

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

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

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

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. impulse synapse receptor vesicles neurotransmitter --Bind to receptors on the next neuron and stimulate the next action potential,

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

29.2 Neurons