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
This process is known as the sliding filament model of muscle contraction because the actin filaments slide over the myosin filaments. The muscular system works with the nervous system to produce the contraction. Neurons (nerve cells) form connections to one or more muscle cells. A chemical, acetylcholine, is released when an impulse is sent which allows the myosin-actin bridge to form.