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

Question

Quizplus · Accepted Answer

The myosin binding site on actin is covered by tropomyosin in the absence of calcium ions, preventing the formation of cross-bridges between actin and myosin, which is necessary for muscle contraction.

There Is No Force Developed in the Absence of Ca2+

There Is No Force Developed in the Absence of Ca²⁺