Search results
Results from the WOW.Com Content Network
A sarcomere (Greek σάρξ sarx "flesh", μέρος meros "part") is the smallest functional unit of striated muscle tissue. [1] It is the repeating unit between two Z-lines. Skeletal muscles are composed of tubular muscle cells (called muscle fibers or myofibers) which are formed during embryonic myogenesis .
The names of the various sub-regions of the sarcomere are based on their relatively lighter or darker appearance when viewed through the light microscope. Each sarcomere is delimited by two very dark colored bands called Z-discs or Z-lines (from the German zwischen meaning between). These Z-discs are dense protein discs that do not easily allow ...
The calcium drives the movement of myosin and actin filaments. The sarcomere then shortens which causes the muscle to contract. [3] In the skeletal muscles connected to tendons that pull on bones, the mysia fuses to the periosteum that coats the bone. Contraction of the muscle will transfer to the mysia, then the tendon and the periosteum ...
They use an example of the contractile elements present in the Porifera, or sponges, that do truly lack this striated muscle containing this protein. Furthermore, Steinmetz, Kraus, et al . present evidence for a polyphyletic origin of striated muscle cell development through their analysis of morphological and molecular markers that are present ...
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath), also called the myolemma, is the cell membrane surrounding a skeletal muscle fibre or a cardiomyocyte.
Fox News host Laura Ingraham says a "real president answers questions" as she reflects on President-elect Donald Trump's openness with the media on "The Ingraham Angle."
Andy Cohen is spilling the tea on what it's like working with longtime friend and colleague Anderson Cooper. Before SiriusXM's 10th Annual Radio Andy Holiday Hangout (which he co-hosts with Amy ...
Huxley had used X-ray diffraction to speculate that muscle proteins, particularly myosin, form structured filaments giving rise to sarcomere (a segment of muscle fibre). Their main aim was to use electron microscopy to study the details of those filaments as never done before. They soon discovered and confirmed the filament nature of muscle ...