Bio Notes - Goals for Chapter 28a Nervous system By the end...

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Goals for Chapter 28a – Nervous system By the end of this chapter, you should be able to: 28.3 Define a resting potential, and explain how it is created. - The voltage across the plasma membrane of a resting neuron is called the resting potential. - The resting potential exists because of difference in ionic composition of the fluids inside and outside the cell. - The plasma membrane surrounding the neuron has channels and umps, made of proteins, that regulate the passage of inorganic ions. One result is that a resting membrane allows much more potassium (K+) than sodium (NA+) to diffuse across the membrane. - 28.4 Explain how an action potential is produced and the resting membrane potential restored. Know the proteins and ions involved in producing an action potential and creating the resting potential. - Action Potential: a nerve signal that carries info along an axon - The resting potential is -70 mV. The stimulus is applied, if it is strong enough, the voltage rises to what is called the threshold.
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