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When a muscle is relaxed are there only thin filaments in the center of the sarcomere?
Wiki User
∙ 10y ago
Yep, you got it.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoNo
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What happens to a sarcomere when muscle length changes?
1. Arrangement of thick and thin filaments: In each sarcomere two sets of actin filaments extend partway toward the center. The myosin filaments are arranged such that they partially overlap the actin filaments. Myosin heads on each side point away from the center of the sarcomere.2. During contraction, the interaction of myosin heads with the actin filaments pulls the thin filaments toward the center of the sarcomere. The actin and myosin filaments slide past each other.3. Cross-bridges = attachement betwn myosin heads and binding sites on actin filaments.4. When a muscle cell is stimulated, myosin heads are energized by ATP. They attach to adjacent actin filaments, and tilt in a short "power stroke" toward the center of the sarcomere. Each power sroke requires an ATP. With many power strokes in rapid succession, the actin filaments are made to slide past the myosin filaments.
What muscle cell filaments come closer together when the sarcomere shortens?
thin filaments
What are the events that influence the width of each sarcomere when a muscle being contracted and relaxed?
What are the events that influence the width of each of sarcomere when a muscle being contracted and relaxed
Which Muscle movement in myosin heads of the thick filaments pull on the thin filaments causing the thin filaments to slide toward the center of the sarcomere?
Flexing of the cross bridge (power stroke)
Interactions between actin and myosin filaments of the sarcomere are responsible for what?
muscle relaxation
A sarcomere is?
A sarcomere consists of thin and thick filaments arranged so they can slide over each other. The boundary of the sarcomere are the Z lines. Thin filaments extend from the Z lines and overlap with thick filaments in the middle of the sarcomere. The I band is on each side of the Z line where only thin filaments occur. The A band is the length of the thick filaments and is divided into three parts; the zone of overlap is on each end where thin and thick filaments occur, the H band is in the middle and has only thick filaments, and the M line is the center of the A band.
What is one of the functional units of a myofibril?
sarcomere
1 Describe the ionic events underlying the nerve action potential 2. Describe the steps in cross bridge cycle that produces skeletal muscle contraction.?
thick filaments pulling thin filaments toward the center of the sarcomere
How are proteins organized in sarcomere?
Thick and thin filaments that slide past each other when a muscle contracts.
What structure runs the length of the sarcomere through the thick filaments and contributes to the elastic recoil in muscle?
titin
What defines a sarcomere?
A sarcomere is the basic unit of a striated muscle. In humans, each muscle is composed of multiple bundles of muscle fibers or cells. Each fiber is comprised of myofibrils. In between sarcomeres lies the z line or the z disc. When strained, the z line appears dark with a distinct border. In the z lines, thin filaments reach toward the center, and overlap. These filaments all represent the structures of the sarcomeres.
What do sarcomere contain?
Sarcomeres are composed of actin (thin filaments) and myosin (thick filaments).
