Striated muscles contain repeating sarcomeres of overlapping arrays of long, thin actin and thicker myosin filaments. Myosin filaments contains the myosin heads, which are enzymes that can bind to actin, split and make use of the energy from ATP. When muscle contraction starts, myosin heads bind to actin, change their configuration on actin, liberating the products of ATP hydrolysis and causing slide of the actin and myosin filaments. The action of the proteins troponin and tropomyosin on the actin filaments regulates vertebrae striated muscle contraction. The release of calcium ions from the sarcoplasmic reticulum is triggered by the nervous stimulation which causes depolarization of muscle membrane. Calcium ions bind to troponin and thus cause or allow the tropomyosin strands on the actin filament to move so that the part of the actin surface where myosin heads need to bind is uncovered. Contraction then occurs and only stops when the sarcoplasmic reticulum pumps calcium out of the muscle interior.
So basically, what triggers the uncovering of the myosin binding site on actin is the calcium ions binding to troponin and changing configuration.
Answer:
Yes and no
Explanation:
The water we drink today is the same the dinosaurs drank because no new water has been created since. However, the cycling of water in the planet requires for it to travel from one sink to another in a process that may last millions of years. For example, the water the dinosaurs drank may have sank to the bottom of the ocean and remain there for millions of years and thus would technically not be the same that we drink today.
The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view , witch is 380 to 700 nanometers
We can confirm that the mutual interdependence that characterizes oligopoly arises because the output for a given market is being generated by a small group of companies.
<h3 /><h3>What is oligopoly?</h3>
Oligopoly is when the market for a given product is controlled by only a few of the companies that create said product. This situation can have benefits as well as drawbacks. A benefit would be increased product variation, providing more choices for consumers, while a drawback would be a lack of competition to keep prices low.
Therefore, we can confirm that the mutual interdependence that characterizes oligopoly arises because the output for a given market is being generated by a small group of companies.
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