How Do Muscles Grow? – Muscle Growth Explanation

Muscles are tissues that actively contract, or get shorter, in order to move parts of the body, they use the energy released from the food we eat and convert it into movement. The skeletal muscular system consists of about 620 muscles that make 40 percent of body weight; muscles are attached to the skeleton by tendons. There are three types of muscles: skeletal, cardiac and smooth. Skeletal muscles move the skeleton under the conscious control of the brain. The other type of muscle work automatically. Cardiac muscle keeps the heart beating. Smooth muscle or involuntary muscle is found in the walls of hollow organs such as intestines and the bladder.

Muscles grow as the human grows, which is normal growth. But muscle growth can be increased by exercises. Muscle growth can be felt by the pain a person get after his exercises. Body builders do a lot of exercises to keep their body fit, thereby ensuring effective muscle growth. Some people believe that it takes too many weeks or sometimes months for a noticeable change, just waiting for the day when their body begins to experience a dramatic surge of progress. But in reality, the only variable is food intake, and when you are consuming the proper amount for muscle gains or fat loss, muscle growth varies from person to person, as it differs based on individual metabolism and the intensity of workouts.

The ratio of intracellular water of the body to the amount of water present within the muscle fiber shows that after the period of infancy, muscle makes up 30 percent of the cell mass, and at adolescence, muscle accounts for about 70 percent of the metabolically active tissues.

Muscle is a tissue in which contains many multiple nuclei that are distributed over the muscle fiber uniformly. In the past, it was believed that growth of a muscle was due to growth and elongation of the fiber, without any increase in the number of nuclei. But actually from infancy to adolescence, humans will undergo a increase in the deoxyribonucleic acid (DNA) content of the muscle tissues. Since the tissue of the muscle contains only diploid nuclei, they contain a constant amount of DNA (approximately 6.2 picograms per nucleus). During intra-uterine life, the process of cell growth (i.e. DNA and protein DNA growth), hyperplasia and hypertrophy occur. After sexual maturation, the cells increase in size for a limited time.

The DNA increase accounts for increases in the content of nuclei within the muscle fibers. The amount of DNA in a muscle is a measure of the nuclear number, and protein content to DNA ratio is a direct measure of cell size. Each nucleus in the muscle has occupation limit over a specific mass of cytoplasm. For example, an octaploid cell has about thrice the mass of cytoplasm of a diploid cell. Samples of muscle tissue from monkeys and rats have shown similar DNA and protein concentrations in the muscle tissues. Thus, it is proved that the increase in number or nuclei present in the muscle constitute muscle growth.

Source by James Mepp

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