Which of the Following Is TRUE According to the Sliding

question 67

Multiple Choice

Which of the following is TRUE according to the sliding filament mechanism of muscle contraction?

• A)When a muscle fiber is not contracting, the thin fibers are not connected to the thick fibers.
• B)When actin pushes the Z lines farther apart, the muscle expands.
• C)The energy for contraction comes from the breakdown of actin into myosin.
• D)The muscle relaxes when calcium ions are released into the fluid surrounding the thick and thin filaments.

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