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What is the functional unit of a muscle called?
Sarcomere
What are the 3 sections along the length of sarcomere?
The three sections along the length of a sarcomere are the A band, the I band, and the H zone. The A band is the dark region in the center of the sarcomere that contains both thick and thin filaments, while the I band is the light region at the ends of the sarcomere that contains thin filaments only. The H zone is the region in the center of the sarcomere where only thick filaments are present.
When a muscle is relaxed are there only thin filaments in the center of the sarcomere?
Yep, you got it.
What is the contracting subunit of skeletal muscle is called a what?
Sarcomere
What is one of the functional units of a myofibril?
sarcomere
What is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
The structural and functional unit of skeleton muscle is called?
sarcomere
The region between two successive Z discs is called?
Sarcomere
What change occur in sacomere during muscle contraction?
The sarcomere itself will become shorter.The sarcomere will shorten.
The segment of a myofibril that is called a sarcomere runs from?
One Z line to the next Z line
Individual muscle cells are called?
muscle fibre
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.
