Wherever destructive metabolism (katabolism) is going on, heat is being set free.
Metabolism and katabolism, indeed all cell-activity, are a priori performances of the mind.
But the biological atoms are living, that is to say, they are continually undergoing anabolism and katabolism, growth and decay.
The former is constructive metabolism, or anabolism; the latter, destructive metabolism, or katabolism.
katabolism, the formation of less complex chemical bodies by the agency of protoplasm, 86.