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CAS BI 108 (112)
Chapter 11.6

Chapter 11.6 Notes

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Boston University
CAS BI 108
Francis Monette

11.6: In a Living Organism, How Do Cells Die? Two ways: (1) Necrosis, (2)Apoptosis Necrosis: cells and tissues are damaged by mechanical means or toxins, or are starved of oxygen or nutrients. These cells often swell and burst, releasing their contents into the extracellular environment. Apoptosis: programmed series of events that result in cell death. But why does this happen? 1. The cell is no longer needed, one example is the connective tissue between web- like hands of a fetus 2. The longer cells live, the more prone they are to genetic damage that could lead to cancer. Events ofApoptosis: • Cell becomes detached from its neighbors and its chromatin is digested by enzymes that cut the DNAinto fragments. • The cell then forms lobes or “blebs” that break up into cell fragments • Living cells usually ingest the remains of t
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