4.2.5.p_rigormortis_revised_for_2015_class.docx - Project 4.2.5 Rigor Mortis Models Introduction Think back to the last time you watched a crime scene

4.2.5.p_rigormortis_revised_for_2015_class.docx - Project...

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Project 4.2.5: Rigor Mortis Models Introduction Think back to the last time you watched a crime scene investigation show on TV or a thriller at the movies. The coroner or medical examiner comes to examine the scene and states that a dead body is in “full rigor” or that “rigor mortis” has set in. You probably figured out that this means that the body is now stiff and the limbs are hard to move, but have you figured out what causes this change? The answer, of course, lies in the science. This stiffening is directly related to the chemical state of your muscles upon death. In Activity 4.2.4, you learned that ATP is required for successful muscle contraction. Now you will zoom in on the sarcomere, the smallest unit of a muscle, and see exactly how ATP is used to make a muscle contract and relax. The sarcomere is made up of two important proteins, actin and myosin . You will investigate the movement of these two fibers in contraction as well as the role other ions, electric stimuli and body systems play in this process. Using your findings, you will design
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