Which of the Following Statements Is True Regarding Cross-Bridges

question 1

Multiple Choice

Which of the following statements is true regarding cross-bridges?

• A) A cross-bridge is the basic unit of active muscle tension.
• B) A cross-bridge is formed when head groups on the actin myofilament bind with tropomyosin on the myosin filament.
• C) Cross-bridges do not occur in lengthening contractions.
• D) A release of sodium is necessary to reveal the binding site on the actin.

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