Which of the Following Statements Regarding Contraction in Skeletal and Smooth

question 24

Multiple Choice

Which of the following statements regarding contraction in skeletal and smooth muscle is true?

• A)In skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity
• B)In skeletal muscle, calcium ion binds to a regulatory protein on thin filaments; in smooth muscle, calcium ion binds to a regulatory protein on thick filaments
• C)In skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin
• D)Both in skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity and in skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin are true
• E)All of the choices are true

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