Working out with weights will stress the muscles so that, while you rest, they rebuild bigger and stronger.
Trauma to the Muscle: Activating The Satellite Cells
When muscles undergo intense exercise, as from a resistance training bout, there is trauma to the muscle fibers that is referred to as muscle injury or damage in scientific investigations. This disruption to muscle cell organelles activates satellite cells, which are located on the outside of the muscle fibers between the basal lamina (basement membrane) and the plasma membrane (sarcolemma) of muscles fibers to proliferate to the injury site (Charge and Rudnicki 2004). In essence, a biological effort to repair or replace damaged muscle fibers begins with the satellite cells fusing together and to the muscles fibers, often leading to increases in muscle fiber cross-sectional area or hypertrophy. The satellite cells have only one nucleus and can replicate by dividing. As the satellite cells multiply, some remain as organelles on the muscle fiber where as the majority differentiate (the process cells undergo as they mature into normal cells) and fuse to muscle fibers to form new muscle protein stands (or myofibrils) and/or repair damaged fibers. Thus, the muscle cells' myofibrils will increase in thickness and number. After fusion with the muscle fiber, some satellite cells serve as a source of new nuclei to supplement the growing muscle fiber. With these additional nuclei, the muscle fiber can synthesize more proteins and create more contractile myofilaments, known as actin and myosin, in skeletal muscle cells. It is interesting to note that high numbers of satellite cells are found associated within slow-twitch muscle fibers as compared to fast-twitch muscle fibers within the same muscle, as they are regularly going through cell maintenance repair from daily activities
When you move, your muscles get little micrscopic tears in them. Then the muscle has to grow over the tears. That's why sometimes people say, " I am ripped".
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An enlarged heart means that the heart is larger in size than a normal heart would be.
These muscles are called "skeletal muscles".
Skeletal muscles.
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The heart and the lungs, these are known as involuntary muscles.
There are many muscles in the human muscular system. The main muscles are the cardiac muscles located near the heart, the biceps muscles, the abdominal muscles and the quadrocept muscles.
Muscles that are connected to bones are called skeletal muscles, voluntary muscles or striated muscles.
Involuntarily controlled muscles