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What are two myofilaments that slide past one another to allow muscle cells to contract?
Actin and Myosin
How are proteins organized in sarcomere?
Thick and thin filaments that slide past each other when a muscle contracts.
What occurs when actin and myosin filaments slide over each other?
The power stroke of the cross bridge which binds ATP disconnecting it from the actin.
What is the function of actin and myosin filaments?
they make up muscle fibers...they slide against one another, causing the muscle to contract or relax
What has the least potential energy a ball on top of a slide a ball going down a slide or a ball on top of a 3 story building?
going down a slide
When thick and thin filaments slide past each other does the fiber lengthen?
Muscles contract when sarcomeres shorten. The thin and thick filaments that compose sarcomeres do not shorten; instead, they slide past one another, causing the sarcomere to shorten while the filaments remain the same length.
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 two myofilaments that slide past one another to allow muscle cells to contract?
Actin and Myosin
How are proteins organized in sarcomere?
Thick and thin filaments that slide past each other when a muscle contracts.
The sliding filament mechanism of muscle contraction involves?
during contraction, the thin filaments slide past the thick filaments so that actin and myosin filaments overlap.
What provides light to allow you to view materials on a slide?
What provides light to allow you to view materials on a glass slide
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 happens when thin filaments in a muscles fiber slide over the thick filament?
Contraction or relaxation of muscle fibre, due to similar effect in sarcomere
Contraction in a muscle occurs because the?
thin filaments slide between the thick filaments Answer #2: Because the action potential reaches the end of the nerve, causing contraction. myofilaments increase the amount that they overlap
Which can shorten during a muscle contraction?
None actually shorten. The thin and thick filaments that compose sarcomeres do not shorten; instead, they slide past one another, causing the sarcomere to shorten while the filaments remain the same length.
When you begin to slide down a slide kinetic energy is converted into energy of motion is this true or false?
true
What are the thin fibers responsible for muscle contraction?
The thin myofilaments are actin. They slide between the thick filaments called myosin.
