3.6.3 skeletal muscles as effectors Flashcards

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1
Q

Describe the role of ATP in muscle contraction

A
  1. Hydrolysis of ATP (on myosin heads) causes myosin heads to bend;
  2. (Bending) pulling actin molecules;
  3. Attachment of a new ATP molecule to each myosin head causes myosin heads to detach (from actin sites);
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2
Q

Describe the role of Ca ions in muscle contraction

A
  1. Calcium ions diffuse into myofibrils from (sarcoplasmic) reticulum;
  2. (Calcium ions) cause movement of tropomyosin (on actin);
  3. (This movement causes) exposure of the binding sites on the actin;
  4. Myosin heads attach to binding sites on actin;
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3
Q

role of glycogen in skeletal muscle?

A
  1. As a store of glucose
    OR
    To be hydrolysed to glucose;
  2. For respiration/to provide ATP;
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