3.6.6: Muscle structure and contraction Describe the roles of ATP in musc Flashcards

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1
Q

Describe the roles of ATP in muscle contraction.

A
  1. To break actinomyosin (bridges);
  2. To move/bend the myosin head/arm;
  3. (So) actin (filaments) are moved (inwards);
  4. For active transport of calcium ions (into the sarcoplasmic/endoplasmic reticulum);
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2
Q

Explain how a decrease in the concentration of
calcium ions within muscle tissues could cause a
decrease in the force of muscle contraction.

A
  1. (Less/No) tropomyosin moved from binding site
    OR
    Shape of tropomyosin not changed so binding site not exposed/available;
    Ignore troponin.
    Reject active site only once.
  2. (Fewer/No) actinomyosin bridges formed;
    Accept actin and myosin do not bind.
    Reject active site only once.
  3. Myosin head does not move
    OR
    Myosin does not pull actin (filaments)
    OR
    (Less/No) ATP (hydrol)ase (activation);
    Reject ATP synthase.
    Do not penalise reference to calcium rather than calcium ions.
    Credit all mark points even if context relates to what happens when calcium
    ions are present.
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