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When a skeletal muscle is fully contracted the are closer to the thick filaments.?
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What muscle cell filaments come closer together when the sarcomere shortens?
thin filaments
What structural protein of skeletal muscle also acts as an enzyme?
Myosin thick 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.
Why do skeletal muscle cells have high numbers of micro filaments?
because many proteins are secreted as hormones
A skeletal muscle's partially contracted state that is normal even when the muscle is not in use is called?
The state of partial skeletal muscle contraction is known as tonus. Muscles of the body do not have a real state of total relaxation.
What type of muscles are striation found in?
The alternating A and I bands on the miofibrils.
How does a muscle contact according to the sliding-filament model of muscle contraction?
When skeletal (or cardiac) muscle contracts, the thin and thick filaments in each sarcomereslide along each other without their shortening, thickening, or folding.
What is a myofliament?
The filaments of myofibrils constructed from proteins, myofilaments, consist of 2 types, thick and thin. Thin filaments consist primarily of the protein actin; thick filaments consist primarily of the protein myosin. The protein complex composed of actin and myosin is sometimes referred to as "actomyosin." In striated muscle, such as skeletal and cardiac muscle, the actin and myosin filaments each have a specific and constant length on the order of a few micrometers, far less than the length of the elongated muscle cell (a few millimeters in the case of human skeletal muscle cells). The filaments are organized into repeated subunits along the length of the myofibril. These subunits are called sarcomeres.
Muscles that contract to bring two bones closer together are called?
A skeletal muscle connects two bones together by the joint and when the muscle contracts it brings the two bones closer together. These skeletal muscles moves the bones.
What cause skeletal muscle to relax-breakdown of thick and thin filaments into inactive polypeptides-sarcomere lengthening-sharp drop in cytoplasmic Ca plus plus levelsd-the transfer of Ca plus plus f?
External brunt force causes the skeletal muscle to relax-breakdown of thick and thin filaments into inactive polypeptides sarcomere.
What type of muscle that can be contracted?
You have control over all striated skeletal muscles. You can not control smooth muscle fibers and cardiac muscle tissues.
What are muscle filaments?
If one were examine any type of muscle cell at the molecular level, what one would find is some kind of structured array of very thin (nano-scale) chains of protein called myofilaments.These are the smallest contractile elements in muscle tissue. There are two kinds of myofilaments: the thin actin filaments (~7 nm diameter), and the thicker myosin filaments (~16 nm diameter).In the case of skeletal and cardiac muscle these filaments alternate many times in parallel to the axis of muscle contraction.During muscle shortening, the job of myosin is to latch on to points along the actin filaments and pull them closer toward each other. During relaxation and muscle lengthening the gap between adjacent actin filaments increases.The muscle cells that are responsible for contracting sphinctors, blood vessels, bronchioli, the iris, and providing gut motility are a bit different. These are called smooth muscle cells. Instead of having a regular array of filaments parallel to axis of force-generation, they are arranged irregularly in a sort of criss-cross fashion that 'squishes' the cell as it contracts.
