Building a Sarcomere Post-lab.docx - Muscular System Mini-lab Contracting a Sarcomere Name Period 1 2 3 4 5 6 7 8 Contracting a Sarcomere The sarcomere

Building a Sarcomere Post-lab.docx - Muscular System...

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Muscular System Name: ____________________________________________ Mini-lab: Contracting a Sarcomere Period: 1 2 3 4 5 6 7 8 Contracting a Sarcomere The sarcomere is the functional unit of a muscle fiber and contains an arrangement of contractile myofilaments. Use your text and notes to answer the following questions. Part III: Contracting a Sarcomere 1.What is the end goal of contraction? 2.In the firststep of contraction, what two things must occur? a. b. 3.After the first step, what is now able to form in the secondstep of contraction? 4. Power Stroke a. What motion do the myosin heads carry out in the third step? b. What happens to the H-zone? c. What happens to ADP and P? 5.What causes the myosin heads to release the active sites in the fourth step?
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6. Return Stroke a. What is broken down in the fifth step? b. What does this allow the myosin heads to do? 7.What signals the end of contraction?
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