ATP binding causes myosin to release actin, allowing actin and myosin to detach from each other.

What molecules bind to the myosin head in order to disconnect from actin?

One part of the myosin head attaches to the binding site on the actin, but the head has another binding site for ATP. ATP binding causes the myosin head to detach from the actin (Figure 4d).
 

What molecule must bind to the myosin head?

The globular heads of myosin bind actin, forming cross-bridges between the thick and thin filaments. It is important to note that the orientation of myosin molecules in the thick filaments reverses at the M line of the sarcomere.

What is required to attach and detach the myosin head to the actin during the sliding filament theory?

Understanding Sliding Filament Theory : Example Question #3



The correct answer is ATP and calcium ions. Myosin head activation to form a cross-bridge with actin requires ATP, and the cleavage of ATP to ADP + P_i contracts the myosin head and pulls the actin.

What molecule is connected to the Z line?

Actin molecules

Actin molecules are bound to the Z-line, which forms the borders of the sarcomere. Other bands appear when the sarcomere is relaxed.

Which molecule is responsible for disconnecting the actin?

Answer and Explanation: The molecule that must bind with myosin to cause cross-bridge detachment is ATP (adenosine triphosphate). When ATP binds to the myosin head, actin detaches and ATP hydrolysis occurs to release energy, putting the myosin head back to its resting state.

What causes the myosin head to detach from the binding site on actin quizlet?

Calcium binds to active sites on actin, forming the cross bridge. Calcium binds to myosin, causing the myosin head to release from the actin myofilament.

Does ATP bind to myosin head?

ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site. ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur.
 

What happens when the ATP molecule binds to the myosin head?

Step 2: ATP binding to the myosin head domain induces a small conformational shift in the actin-binding site that reduces its affinity for actin and causes the myosin head to release the actin filament.

What protein does myosin bind to?

As well as binding to myosin, MyBP-C also binds to another thick filament component, titin. Titin lies axially along the length of the filament,³⁹ most likely as three pairs of titin molecules.

Does myosin head bind to tropomyosin?

Tropomyosin blocks myosin binding sites on actin molecules, preventing cross-bridge formation and preventing contraction in a muscle without nervous input. Troponin binds to tropomyosin and helps to position it on the actin molecule; it also binds calcium ions.

What is bound to the myosin heads quizlet?

Myosin heads bind to actin and undergo power stroke causing sarcomere shortening* and muscle contraction.

What are the two binding sites on myosin head?

The myosin heads have two reactive sites: One allows it to bind with the actin filament, and one binds to ATP. Only when the myosin heads bind to the active sites on actin, forming a cross-bridge, does contraction occur.