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Breakdown of ATP and Cross-Bridge Movement During Muscle Contraction (Quiz 2)

What is the pathway of energy transfer during muscle movement? The contraction of skeletal muscles is one of the most energetically expensive activities that the body does on a regular basis. Adenosine triphosphate (ATP) is split into adenosine diphosphate (ADP) and phosphate to supply the energy for muscle contraction. The free energy released by the ATP when the phosphate is split off is transferred to the heads on the myosin filaments. The heads move and store potential energy in their new position. When the heads interact with actin, the energy is used to slide the filaments past one another transferring the energy into movement (kinetic energy).

View the animation below, then complete the quiz to test your knowledge of the concept.






1Muscle contractions are initiated by binding of
A)potassium ions to troponin.
B)potassium ions to tropomyosin.
C)calcium ions to troponin.
D)calcium ions to tropomyosin.
E)calcium ions to both troponin and tropomyosin.



2During muscle contractions, cross-bridges form between
A)myosin heads and tropomyosin filaments.
B)myosin heads and actin filaments.
C)myosin heads and ATP molecules.
D)actin heads and troponin filaments.
E)actin heads and tropomyosin filaments.



3Which of the following is the site of ATP binding and hydrolysis?
A)troponin
B)tropomysin
C)actin
D)myosin
E)Both A and B



4The binding of ATP allows the muscle filaments to slide past one another.
A)True
B)False



5After cross-bridges form, phosphate is released and then ADP follows.
A)True
B)False







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