There Is No Force Developed in the Absence of Ca²⁺

question 15

Multiple Choice

There is no force developed in the absence of Ca²⁺ because

• A) The myosin binding site on actin is covered up by tropomyosin
• B) The myosin binding site on actin is covered up by tropomodulin
• C) The acto-m yosin cross bridges are in the rigor state
• D) The RyR is closed
• E) The myosin heads rem ain bound to actin and can’t cycle

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