Muscle Contraction and ATP
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Questions and Answers

What is the molecular weight of each myosin molecule?

  • About 480,000 (correct)
  • About 200,000
  • About 20,000
  • About 960,000

How many heavy chains are there in a myosin molecule?

  • Eight
  • Two (correct)
  • Six
  • Four

What causes the sarcoplasmic reticulum to release large quantities of calcium ions?

  • Action potential traveling along the muscle fiber (correct)
  • Interaction of myosin and actin filaments
  • Energy released from ATP degradation
  • Formation of myosin filaments

What forms a double helix in a myosin molecule?

<p>Two heavy chains wrapping around each other (A)</p> Signup and view all the answers

What is the molecular weight of each myosin molecule?

<p>About 480,000 (B)</p> Signup and view all the answers

Where does the energy for the contractile process come from?

<p>High-energy bonds in the ATP molecule (C)</p> Signup and view all the answers

How many polypeptide chains make up a myosin molecule?

<p>Six (D)</p> Signup and view all the answers

What is the structure formed by the heavy chains in a myosin molecule?

<p>Double helix (A)</p> Signup and view all the answers

What provides the energy for the contractile process to proceed?

<p>High-energy bonds in ATP (D)</p> Signup and view all the answers

What activates the forces between the myosin and actin filaments to initiate contraction?

<p>Calcium ions (A)</p> Signup and view all the answers

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