Multiple Choice
What is the ion released from the terminal cisternae that combines with troponin and removes the blocking action of tropomyosin, resulting in the formation of cross bridges?
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9. Muscle Tissue
Steps of Muscle Contraction
Multiple Choice
In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and __________.
A
troponin
B
tropomyosin
C
actin
D
myosin
E
thin filaments
Verified step by step guidance1
Understand the sliding filament model: This model explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the sarcomere, the functional unit of a muscle fiber.
Identify the key players: In muscle contraction, the primary myofilaments involved are actin (thin filaments) and myosin (thick filaments).
Recognize the role of myosin: Myosin is a motor protein that interacts with actin to produce muscle contraction. It forms cross-bridges with actin filaments, pulling them inward during contraction.
Differentiate between actin and regulatory proteins: Actin is the main component of thin filaments, while troponin and tropomyosin are regulatory proteins that control the interaction between actin and myosin.
Conclude the interaction: In the sliding filament model, actin and myosin filaments slide past each other, leading to muscle contraction. Therefore, the correct answer to the problem is that actin overlaps with myosin.
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