Many composite layup designs also include a co-curing or post-curing of the prepreg with various other media, such as honeycomb or foam. This is commonly called a sandwich structure. This is a more common layup for the manufacture of radomes, doors, cowlings, or non-structural parts.
Troponin is a protein that helps hold tropomyosin in place on the actin filament. A muscle contraction consists of a series of repeated events. First, calcium triggers a change in the shape of troponin and reveals the myosin-binding sites of actin beneath tropomyosin. Then, the myosin heads bind to actin and cause the actin filaments to slide. Finally, ATP breaks the actin-myosin bond and allows another myosin 'oar stroke' to occur. Repetition of these events causes a muscle to contract. Learning Outcomes. After this lesson, you'll be able to: Identify the structure of myosin and actin
Contractions happen when actin filaments actually slide over myosin filaments. This slide causes a change in the shape of the muscle cells producing movement, which is considered a muscle contraction. Depending on the muscle and the intended outcome of the contraction, muscles can either lengthen or shorten.nstead, a muscle contraction of smooth or cardiac muscle is initiated within the organ itself. Within the digestive system, the introduction of food is what causes the contractions to move the food through the system.