Human body shape is a complex phenomenon with sophisticated detail and function. The general shape or figure of a person is defined mainly by the molding of skeletal structures, as well as the distribution of muscles and fat. Growth is usually completed between the ages of 13 and 18, at which time the epiphyseal plates of long bones close, allowing no further growth see Human skeleton. During puberty , differentiation of the male and female body occurs for the purposes of reproduction. In adult humans, muscle mass may change due to exercise, and fat distribution may change due to hormone fluctuations. Inherited genes play a large part in the development of body shape.
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The body fat percentage BFP of a human or other living being is the total mass of fat divided by total body mass , multiplied by ; body fat includes essential body fat and storage body fat. Essential body fat is necessary to maintain life and reproductive functions. The percentage of essential body fat for women is greater than that for men, due to the demands of childbearing and other hormonal functions.
Metrics details. Sex differences are known to impact muscle phenotypes, metabolism, and disease risk. Skeletal muscle stem cells satellite cells are important for muscle repair and to maintain functional skeletal muscle.