10 Questions
What is the molecular weight of each myosin molecule?
About 480,000
How many heavy chains are there in a myosin molecule?
Two
What causes the sarcoplasmic reticulum to release large quantities of calcium ions?
Action potential traveling along the muscle fiber
What forms a double helix in a myosin molecule?
Two heavy chains wrapping around each other
What is the molecular weight of each myosin molecule?
About 480,000
Where does the energy for the contractile process come from?
High-energy bonds in the ATP molecule
How many polypeptide chains make up a myosin molecule?
Six
What is the structure formed by the heavy chains in a myosin molecule?
Double helix
What provides the energy for the contractile process to proceed?
High-energy bonds in ATP
What activates the forces between the myosin and actin filaments to initiate contraction?
Calcium ions
Test your knowledge of muscle contraction and the role of ATP in the process. Understand how the action potential triggers the release of calcium ions from the sarcoplasmic reticulum and initiates the contraction of myofibrils through the interaction of myosin and actin filaments.
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