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A myosin hooks onto and pulls against a partner protein called?
When a skeletal muscle contracts, a protein called a myosin hooks onto and pulls against a "partner" protein calledA. actin.B. a sarcoplasm.C.myofibril.D. a sarcomere.the answer is A actin
Why does muscle contraction occur?
Muscle contraction occurs due to the interaction between actin and myosin filaments within muscle fibers. When a muscle is stimulated by a nerve impulse, calcium ions are released, triggering the binding of myosin heads to actin, forming cross-bridges. This interaction pulls the actin filaments closer together, shortening the muscle fiber and generating force. ATP provides the energy required for this process, allowing the myosin heads to detach and reattach for continued contraction.
What is the name of the belt that holds sister chromatids together?
actin filaments
What is a force beginning with G that pulls something together?
Gravitational force (or gravity) is a force that pulls things together.
What are the myofilaments called in a muscle cell?
The myofilaments in a muscle cell are called actin and myosin. Actin and myosin are protein filaments that work together during muscle contraction to generate force and movement.
Describe the process that cause the muscle to contract?
# When the muscle is in a resting state, thin strands of a protein called tropomyosin are wrapped around the actin filaments, blocking the myosin binding sites. This keeps the myosin from binding to actin. # Molecules called troponin are attached to the tropomyosin. # When calcium is introduced into the muscle cell, calcium ions bind to troponin molecules. # Calcium then pulls troponin, causing tropomyosin to be moved as well, therefore causing the myosin binding sites on the actin to be exposed. # Myosin binds to the now-exposed binding sites. # As soon as the myosin head binds to actin, the head bends at its hinge. # Once the head bends, the myosin loses energy, and remains attached to the actin. # When re-energized by adenosine triphosphate (ATP), the myosin head detaches from the actin filament, and is ready to attach and bend again. # The collective bending of numerous myosin heads (all in the same direction), combine to move the actin molecules closer together. This results in a muscle contraction.
What filament are composed of actin?
Actin filaments, also known as microfilaments, are primarily composed of actin protein. These filaments are crucial components of the cytoskeleton in eukaryotic cells, providing structural support and enabling various cellular processes such as muscle contraction, cell motility, and division. Actin exists in two forms: G-actin (globular actin), which is the monomeric form, and F-actin (filamentous actin), which is the polymerized form that forms long helical chains. Together, these filaments play a vital role in maintaining cell shape and facilitating intracellular transport.
How did the sun from?
form in nebulagravity pulls together
What myofilament does the pulling?
The myosin myofilament pulls on the actin myofilament during muscle contraction. This interaction, known as the sliding filament theory, results in the shortening of the sarcomere and muscle contraction.
What protein has cross-bridge heads that pull on the thin fiber?
The protein responsible for the cross-bridge mechanism that pulls on the thin filament is myosin. In muscle contraction, myosin heads attach to binding sites on the actin filaments (the thin fibers) and pull them closer together, which shortens the muscle fiber. This process is driven by the hydrolysis of ATP, providing the energy necessary for contraction. The interaction between myosin and actin is fundamental to muscle movement and contraction.
When a skeletal muscle contracts a protein called a myosin hooks onto pulls against a partner protein called?
When a skeletal muscle contracts, a protein called a myosin hooks onto and pulls against a "partner" protein calledA. actin.B. a sarcoplasm.C.myofibril.D. a sarcomere.the answer is A actin
What is the force that pulls object together?
gravity will pull two objects together
