Chapter02-7db2f.pdf - Chapter 2 Electrophysiology Chapter 2...

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6/25/12 1 Chapter 2 Electrophysiology Chapter 2 Electrolytes ! Electrolytes are how a cell develops ± electricity. ² ! ECG is altered by electrolyte abnormality. ! Imbalances can cause life-threatening problems.
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6/25/12 2 Chapter 2 Visualize that: " The heart is made up of a series of small barrels. " Each barrel is made up of two halves. " The halves slide over each other. " Halves are held together by interlocking pieces ( myosin and actin proteins). Mechanics of Contraction (1 of 3) Chapter 2 " The outsides of the barrels are fused together to form long bands ( myofibrils ). " Bands are held together side by side by wire ( connective tissue ) to form sheets. " Sheets are covered with fluid ( extracellular fluid ). Mechanics of Contraction (2 of 3)
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6/25/12 3 Chapter 2 Main function of bands: To contract and expand ! When one barrel contracts, whole sheet shortens by small amount. ! When all barrels contract, whole sheet shortens significantly. Sheet returns to original size as all barrels relax.
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