The developmental sequence of events leading to the formation of adult muscle that occurs in the anima. In vertebrate skeletal muscle the main events are: the fusion of myoblasts to form myotubes that increase in size by further fusion to them of myoblasts, the formation of myofibrils within their cytoplasm and the establishment of functional neuromuscular junctions with motor neurons. At this stage they can be regarded as mature muscle fibers [goid 7519] [evidence IEA]; The process of gaseous exchange between an organism and its environment. In plants, microorganisms, and many small animals, air or water makes direct contact with the organism's cells or tissue fluids, and the processes of diffusion supply the organism with dioxygen (O2) and remove carbon dioxide (CO2). In larger animals the efficiency of gaseous exchange is improved by specialized respiratory organs, such as lungs and gills, which are ventilated by breathing mechanisms [goid 7585] [pmid 9873040] [evidence TAS]; The flow of blood through the body of an animal, enabling the transport of O2 and nutrients to the tissues and the removal of waste products [goid 8015] [pmid 8096434] [evidence TAS]; The flow of blood through the body of an animal, enabling the transport of O2 and nutrients to the tissues and the removal of waste products [goid 8015] [pmid 9873040] [evidence TAS]; The multiplication or reproduction of cells, resulting in the expansion of a cell population [goid 8283] [pmid 9607766] [evidence TAS]; Morphogenesis of an organ. An organ is defined as a tissue or set of tissues that work together to perform a specific function or functions. Morphogenesis is the process by which anatomical structures are generated and organized. Organs are commonly observed as visibly distinct structures, but may also exist as loosely associated clusters of cells that work together to perform a specific function or functions [goid 9887] [pmid 9580666] [evidence TAS]; Any process that modulates the frequency, rate or extent of the assembly of actin filaments by the addition of actin monomers to a filament [goid 30833] [evidence IEA]; Assembly of a stress fiber, the bundle of microfilaments and other proteins found in fibroblasts [goid 43149] [evidence IEA]