Abstract
Summary
Determinations have been made of the concentration of chloride, fat and water in the gastrocnemius muscles and serum from 7 groups of rats ranging from 15 to 365 days of age. From these data calculations have been made concerning the relative masses of connective tissue and muscle cell phases present in the muscles at the various ages. Values characteristic of adult tissue are found at 90 days of age. Thereafter approximately a constant composition was observed. The calculated values for the connective tissue phase show a range of 40% of the total mass at 15 days to 15% at 90 days of age. The calculated percent of water in muscle cells decreases during the growth period.
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