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Calcium ions bind to troponin and change its shape.
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The binding of calcium to which molecule causes the myosin binding sites to be exposed?
Troponin binds to the Calcium ions to expose the actin to the myosin heads.
Myosin contains two binding sites for what two molecules?
ATP (--> ADP+Pi) and actin
What is the name of the regulatory protein?
myosin and actin
What hormones support the formation of actin and myosin?
Growth factor harmones support the formation of actin and myosin.
What is the crossbridge cycle?
The crossbridge cycle is the cyclical formation of links between actin and myosin. This results in the sliding of thin filaments towards the M line of a sarcomere. The myosin head undergoes conformation changes which allows it to swivel back and forth. In its low energy form, myosin has a low affinity for actin. The ATP prepares myosin for binding with actin by moving it to its high energy form position. When myosin contracts, it has a high affinity for actin.
What specifically is cross bridge?
myosin binding to actin
The binding of calcium to which molecule causes the myosin binding sites to be exposed?
Troponin binds to the Calcium ions to expose the actin to the myosin heads.
The ability of myosin to interact with actin is regulated by the binding of?
Ca2+ to troponin
What immediately follows the binding of ATP to the myosin head?
The myosin head pivots, moving the actin strand.
What are the proteins are involved in muscle contraction?
Actin and myosin
What molecule has a binding site for myosin heads?
Myosin heads bind to the actin binding site, and also has a part where ATP binds
What muscle cell protein covers the myosin binding sites on actin fimlaments?
tropomyosin
What substance triggers muscle contractions?
Ca++ ions initiate the movements but actin and myosin hormones regulates it.
Myosin contains two binding sites for what two molecules?
ATP (--> ADP+Pi) and actin
What specific event triggers the uncovering of the myosin site on actin?
Calcium ions bind to troponin and change its shape.
What are the names of protein filaments in a muscle fiber?
Actin Filaments
How do proteins actin and myosin interact to make a muscle contract?
Myosin and Actin
