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Myofilament are long tubular structures inside of muscle cells that are made up of shorter contractile sections called sarcomeres.

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17y ago

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What protein makes up the thick myofilament?

The protein that makes up the thick myofilament in muscle cells is called myosin. Myosin is a motor protein that plays a key role in muscle contraction by interacting with actin, the protein in the thin myofilament.


What is the correct order of structures as you move from outside a muscle cell to deep inside it?

The correct order is: epimysium (outer connective tissue layer), perimysium (connective tissue surrounding muscle fascicles), endomysium (connective tissue surrounding individual muscle fibers), sarcolemma (muscle cell membrane), sarcoplasm (muscle cell cytoplasm), myofibrils (contractile units within muscle fibers).


What is needed besides calcium for contraction to occur?

An action potential. It is the nerve impulse that enters into sarcomeres from the sarcoplasmic reticulum and provides the energy for the calcium ions to briefly bind to the troponin on the actin myofilament to allow for contraction to occur by bringing the Z-lines closer together.


Which proteins found myofilaments contains the cross bridge?

The two muscle filaments are Myosin and Actin. Myosin is the thicker of the two. When a muscle contracts, a hook like particle extends off the myosin and grabs the actin pulling it in causing the contraction/ tension of the muscle


How are the striations of a skeletal muscle produced?

Striations in skeletal muscle are produced by the repeating arrangement of protein filaments called actin and myosin. These filaments overlap in a specific pattern, forming alternating light and dark bands known as striations. When muscles contract, the actin and myosin filaments slide past each other, resulting in the shortening of the muscle and the appearance of the striations.