Essay on How The Muscle Fibers Affect The Presence Of Atp Contracted

838 Words Oct 16th, 2014 4 Pages
The muscle fibers in the presence of ATP contracted 0.07cm and 3.3% change. Under the microscope, figure 1 shows the striated fiber by clearly indicating the bands and lines of the striation. In addition, solution B, with ATP plus Salt (KCl, MgCl2) contracted the muscle fiber by 0.24cm and 9.2% change. Finally, solution C, containing only salt (KCl, MgCl2) also contracted the muscle fiber by 0.13cm and 6.1% change. Figure 2 shows the effect after adding salt and shows the striations of the fiber. Therefore, muscle fibers were found to contract after the application of the three solutions. However, solution B (ATP + Salt), had a greater effect than the other two solutions based on the percentage of contraction which was 9.2%.
Discussion:
Petri Dish A
The muscle fibers in the presence of ATP shortened by 0.07cm and 3.3% change, which means that the muscle contracted. According to Boundless, ATP is required for muscle contraction since it prepares the myosin for binding in the cross-bridge muscle contraction cycle (Boundless). Thus, ATP activates the myosin heads for binding to actin forming a cross-bridge and then the myosin head bends, which release ADP and phosphate. At the molecular level, Fox explains that the muscle filaments are composed of actin monomers in a double helix, which contain myosin molecules. In order for the muscle to contract, the myosin heads must bind to ATP, hydrolyze to ADP and inorganic phosphate abbreviated as Pi, and stay bound to the myosin head…

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