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Do the lengths of the thick and thin filament change when a muscle contracts?
Wiki User
∙ 13y ago
No. The myosin heads extend to the thin filament ( actin ) and pull themselves along with a stroke motion. They slide past one another, but they themselves lose none of their length in doing so.
Wiki User
∙ 13y ago
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When a muscle contracts how does its form change?
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
What is a smooth muscle that contracts or relaxes to change the volume of the chest?
The Diaphragm.
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.
How does a muscle contract according to the sliding-filament model of muscles 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 does a muscle become when it contracts?
A muscle becomes shorter when it contracts.
How do banding patterns change when a muscle contracts?
When a muscle contracts, the actin and myosin myofilaments come together, the H zones and I zones shrink and become very narrow. The A band does not changing during contraction.
Explain how a skeletal muscle contracts and relaxes?
Contraction:Calcium ion (from sarcoplasmic reticulum) binds to troponin of actin filament.Re-orientation occurs in actin filament allowing it to bind to the myosin filament.Globular head of myosin filament binds to actin filament.Myosin filament splits an ATP molecule and as result it bends causing actin filament (attached to it) to slide over it. When the overlap of actin and myosin filament is maximum, filaments will occupy less space thus muscle is in contracted state.Relaxation:ATP binds to myosin filament and myosin returns to its original position (relaxed state).Sarcoplasmic reticulum re-accumulates the calsium ion by active transport. As the result actin filament is dettached from myosin filament.When the overlap of myofibrils is minimal, muscle will be in relaxed state.
What muscle filament uses ATP?
Myosin
When one muscle contracts what happens to the opposing muscle?
When one muscle in a pair contracts the other expands.
When the muscle contracts it is?
Flexion
When muscle contracts it is?
Flexion
When a muscle contracts it?
shortens
