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Biology 311C Lecture 13 - Biology 311C Lecture 13...

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September 23, 2011 Biology 311C Lecture 13 Microfilaments are two intertwined strands of actin, each a polymer of actin subunits. They are of 7 nm diameter. They are made out of actin protein subunits. Its main functions are maintenance of cell shape (tension-bearing elements)… A muscle cell is made out of actin filament, myosin filament, and myosin head. They are made from the smooth ER. When calcium is pumped out of the cytoplasm, the myosin heads attach and the muscle cell relaxes. During rigor mortis, no ATP is being produced and the myosin heads cannot detach from the myosin filament because there is a calcium flood. To detach, you need ATP. The body’s muscles start to relax after 72 hours of death. The proteins start to decompose. The myosin heads are broken down by bacteria so you no longer have the myosin heads in contact with the filaments so the muscles relax. The two proteins involved in this is microfilaments and myosin. Dynein is also involved.
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