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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 prevents actin myofilaments from sliding backward when a myosin head releases?
During contraction, there are always some myosin heads attached to the actin myofilament when other myosin heads are detaching.
What is a Eccentric muscle contraction?
That is the negative portion of a movement. Lowering the weight during a bench press
Which structure is responsible for keeping the myocardial cells together during contraction?
desmosomes
What acts as ATPase during the contraction cycle of muscle?
myosin cross-bridges
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.
What are the differences between the a and i bands in terms of their function and structure?
The A band is the dark band in a sarcomere that contains thick myosin filaments and does not change length during muscle contraction. The I band is the light band that contains thin actin filaments and shortens during muscle contraction. The A band provides stability and structure, while the I band allows for muscle contraction and relaxation.
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
Structure derived from the foregut portion of the gut tube during development?
pharynx to part 2 of the duodenum
How does the i band in muscle contribute to the overall structure and function of muscle tissue?
The I band in muscle contains actin filaments that help with muscle contraction. It contributes to the overall structure and function of muscle tissue by allowing for the sliding of actin and myosin filaments during muscle contraction, which leads to muscle movement and strength.
What muscle contraction occurs in the biceps brachii during the upward phase of the bicep curl?
a concentric contraction- a concentric contraction involves the muscle length, shortening during a contraction! YA-trick-YA!
Does the Z line shorten during muscle contraction?
Yes, the Z line shortens during muscle contraction.
