1. Rigor mortis occurs after a person dies because muscle cells are no longer su
ID: 95142 • Letter: 1
Question
1. Rigor mortis occurs after a person dies because muscle cells are no longer supplied with ATP. This causes the muscles to become rigid and stuck in position. Based on your knowledge of muscle contraction, why would muscles become rigid, rather than limp, after death?
2. The term fibrillation refers to an irregular, ineffective heartbeat. Do you think ventricular fibrillation is more or less serious than atrial fibrillation in a human? Explain your reasoning.
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Explanation / Answer
1) When a person dies his muscles become rigid after few hours because lack of ATP.ATP need to pump back the calcium in endoplasmic reticulum before the relaxation of muscles.Muscles become rigid because the calcium ions remains in cell cytoplasm and toponin molecules cannot return back to occupy the active sites of actin.This is the main reason that muscles become rigid than limp after death.
2) Yes ventricular fibrillation is more serious than atrial fibrillation because in atrial fibrillation the heart beat rate and rhe rythm will be regular but coming to ventricular fibrillation,the heart will no longer pump blood.Verticular fibrillation will definately leads to death but atrial fibrillation is not that much dangerous.
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