GLOSSARY

Urea Cycle is the hepatic cycle converting nitrogen into urea for excretion.

Transamination transfers amino groups rather than necessarily releasing ammonia directly. Deamination, deamidation and amination handle different groups or directions. Ammonia and ammonium are acid-base-related forms. Transport and disposal systems regulate nitrogen. Exercise fatigue alone does not establish dangerous ammonia accumulation or a self-treatment need. Distinguish reaction chemistry from a clinical disorder, and assess context rather than equating every nitrogen-containing metabolite with harmful waste or every aminating step with muscle growth.

The liver converts nitrogen through the urea cycle, with kidneys important for urea excretion. Production and excretion are separate steps; hydration and organ function also influence concentration. One high value does not precisely diagnose protein intake or muscle injury. Nitrogen disposal does not justify excessive drinking or unnecessary removal of adequate protein in healthy athletes. Interpret laboratory findings within the clinical and dietary context rather than treating urea as a simple score of training damage.