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De/Hyperpolarization

Chapter 11 - A & P Lecture

QuestionAnswer
depolarization inside of cell becomes more pos.
factors that cause depolarization sodium ions, calcium ions, potassium ions,
depolarization due to sodium ions most common
depolarization due to calcium ions - depolarization in cardiac muscle - other functions: regulates voltage gated Na channels and neurotransmitter secretion
depolarization due to potassium ions - diffuse out - changes in extracellular concentration of K+ affect RMP - if excellular K+ levels increase membrane becomes depolarized
hyperpolarization inside becomes neg.
2 main ways to hyperpolarize: potassium ions & chloride ions
hyperpolarization due to potassium ions -most common
hyperpolarization due to chloride ions - higher concentration outside so diffuse into - mechanism for some inhibitory neurotransmitters
 

 



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