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What does myosin attach to?
During muscle contraction, myosin cross bridges attach to active sites of ACTIN FILAMENTS.
During skeletal muscle contraction myosin cross bridges attach to active sites of?
During skeletal muscle contraction myosin cross bridges attach to active sites of actin filaments. Actin filaments bind ATP. Their growth is regulated by thymosin and profilin.
Myosin cross bridges attach to active sites of?
actin filaments in muscle cells during muscle contraction.
During muscle contraction....... attach to ...............?
Troponin
What structures do the cross bridges attach during muscle action?
actin
What happens during skeletal muscle contraction?
During skeletal muscle contraction, motor neurons activate muscle fibers, causing calcium ions to be released from the sarcoplasmic reticulum. The calcium ions bind to troponin, leading to the exposure of active sites on actin filaments. Myosin heads then attach to these active sites, form cross-bridges, and pull the actin filaments towards the center of the sarcomere, resulting in muscle contraction.
Which muscle protein forms cross-bridges?
The muscle protein that forms cross-bridges is myosin. Myosin molecules have a head region that binds to actin filaments, enabling muscle contraction through the sliding filament mechanism. When myosin heads attach to actin, they pivot, pulling the actin filaments closer together, which shortens the muscle fiber and generates force. This interaction is crucial for muscle contraction during activities such as movement and posture maintenance.
How are cross bridges created during a muscle contraction?
Cross bridges are formed during muscle contraction when the myosin heads of thick filaments attach to binding sites on the actin filaments of thin filaments. This interaction occurs when calcium ions are released, leading to a conformational change in the troponin-tropomyosin complex that exposes the binding sites on actin. Once the myosin heads bind to actin, they pivot and pull the actin filaments inward, resulting in muscle shortening and contraction. This process is powered by ATP hydrolysis, which re-cocks the myosin heads for another cycle of cross-bridge formation.
What heads does actin attach to?
Actin filaments primarily interact with myosin heads during muscle contraction. Myosin heads attach to actin filaments through the formation of cross-bridges, enabling the sliding mechanism that results in muscle shortening. Additionally, actin can associate with other protein complexes, such as those involved in cellular movement and shape maintenance, but myosin is the primary motor protein interacting with actin in muscle cells.
What is the Ac-tin behavior during the power stroke?
During the power stroke of muscle contraction, actin filaments slide past myosin filaments, resulting in the shortening of the muscle fiber. This process is initiated when myosin heads, which are bound to ADP and inorganic phosphate, attach to binding sites on actin, forming cross-bridges. The release of ADP and phosphate triggers the conformational change in the myosin head, pulling the actin filament inward. This sliding mechanism is a key component of the sarcomere's contraction, leading to muscle shortening and force generation.
What is the region where enzymes attach to their substrates?
The active site.
How many points do muscles attach to the skeleton?
Muscles typically attach to the skeleton at two points: the origin and the insertion. The origin is the fixed attachment point, while the insertion is the point that moves during muscle contraction. This arrangement allows for efficient movement and stability of the skeletal system.
