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The length of the thick filament is the A band. The A band contains both thick and thin filament because they are overlapping each other.
The H band is thick filament only, however, it only covers a portion of width of the thick filament.
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What is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
Thin filaments of water molds?
Hyphae
Thin-film interference occurs when one clean glass plate it placed on top of another glass plate What does the thin film consist of in this case?
none
Who invented carbon filaments?
Joseph Swan invented carbon filaments.
What band does not change its length during shortening of the sarcomere?
the A-bandsthe A-bands
What muscle cell filaments come closer together when the sarcomere shortens?
thin filaments
What is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
Thin filaments at either end of the sarcomere are attached to interconnecting filaments that make up the what?
Z lines
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.
When a muscle is relaxed are there only thin filaments in the center of the sarcomere?
Yep, you got it.
How is the H band distinguished from the other prominent structural features of the sarcomere?
It is a lighter region that contains thick filaments, but no thin filaments.
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)
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.
What do sarcomere contain?
Sarcomeres are composed of actin (thin filaments) and myosin (thick filaments).
How are proteins organized in sarcomere?
Thick and thin filaments that slide past each other when a muscle contracts.
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 makes up myofibrils?
Thin filaments consist primarily of the protein actin, coiled with nebulin filaments. Thick filaments consist primarily of the protein myosin, held in place by tit in filaments.
