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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.
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∙ 9y ago
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When one skeletal muscle contracts and it opposing mucsle relaxes it is an example of?
antagonistic muscle action.
Are striated under skeletal muscle?
Because muscle cells can only contract, not extend, skeletal muscles most work in pairs. While one muscle contracts, the other muscle in the pair relaxes to its original length.
When a muscle contracts how does its form change?
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
When one muscle contracts what dose the other muscle do?
Relaxes
What does the other muscle do when one relaxes?
It Contracts
When one muscle contracts what do the opposite do?
It relaxes
How do skeletal muscles work as a pair to bend and straighten the arm at the elbow?
When you bend your elbow, the biceps muscle contracts. At the same time the antagonist muscle, that is the triceps muscle relaxes in synchronized manner. Vise verse action take place, when you straighten the arm at the elbow. Triceps contracts and biceps relaxes.
Which muscle relaxes when arm is strightened?
The bicep muscle. The tricep contracts to straighten the arm as the bicep relaxes.
What muscle contracts and relaxes to pump blood?
The heart
What does one muscle do while the other one relaxes?
contracts - for antagonistic muscle pairs e.g. muscles in arm (when one relaxes, other contracts, and vice versa)
When the bicep contacts what muscle relaxes?
When the bicep contracts, the tricep relaxes. These pair of muscles are known as antagonists which means as one contracts, the other relaxes and vice versa.
What is the muscle that contracts and relaxes so that you can breath is the?
It is called your diaphragm.
