Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Muscle fibers generate more tension if the starting length of their sarcomeres is very short.
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9. Muscle Tissue
Sliding Filament Theory and the Sarcomere
Multiple Choice
In the sliding filament theory, what causes the myosin head to disconnect from actin?
A
The binding of ATP to the myosin head
B
The hydrolysis of ATP to ADP and inorganic phosphate
C
The release of calcium ions from the sarcoplasmic reticulum
D
The binding of calcium ions to troponin
Verified step by step guidance1
Understand the sliding filament theory: This theory explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the sarcomere and thus the muscle.
Identify the role of myosin and actin: Myosin heads bind to actin filaments to form cross-bridges, which are essential for muscle contraction.
Recognize the role of ATP in muscle contraction: ATP binds to the myosin head, causing it to detach from the actin filament. This is a crucial step in the cycle of muscle contraction and relaxation.
Consider the process of ATP hydrolysis: After ATP binds to the myosin head, it is hydrolyzed to ADP and inorganic phosphate, which provides the energy needed for the myosin head to return to its original position.
Understand the role of calcium ions: Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, which causes a conformational change that allows myosin heads to bind to actin. However, the detachment of myosin from actin is specifically triggered by ATP binding.
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