[What is the "terrain"?].
D000136:Acid-Base Equilibrium; D000293:Adolescent; D000328:Adult; D004702:Endocrine Glands / Q000502:physiology; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged
Qu'est-ce que le "terrain"?