THE NERVE IMPULSE A _________is a nerve

THE NERVE IMPULSE A _________is a nerve cell which transmits information in the nervous system. This information is carried by an electrical signal called a ____________ ___________. Another name for this electrical signal is the ___________ __________________. The main intracellular ion is _____________. These positively charged ions are pumped into the cell by ATP. During polarization, which is the ____________state, the inside of the cell is Negative/positive(circle one) due to the _____________of ____________ions. When the neuron is stimulated _______________ crosses the cell membrane making the inside of the cell ______________________. It is this inward diffusion of _________ that causes depolarization, the _________________state. Soon after the cell depolarizes, the cell membrane changes and now stops diffusion of _______________ into the cell. It also allows ___________to diffuse out of the cell. These changes give the inside of the cell a _______________charge. This is called _____________________________. Repolarization is due to the diffusion of __________________out of the cell. The nerve impulse moves point by point along the neuron like a wave. TRANSMISSION ACROSS A SYNAPSE The space between two neurons is called a___________________. Information needs to be transmitted across this synapse. The nerve impulse travels point by point along the neuron until it reaches the axon terminal. This _________________causes vesicles to release _____________________ into the __________________________. This neurotransmitter causes a new nerve impulse to form in the next neuron. The name of this neurotransmitter substance is ______________________________. Once the acetylcholine has done its job it is inactivated by the enzyme _________________________-.

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