A distinction can be made between proximal ageing (age-based effects that come about because of factors in the recent past) and distal ageing (age-based differences that can be traced back to a cause early in person's life, such as childhood poliomyelitis).
physiologic. pertaining to physiology; normal; not pathologic. physiologic saline solution (physiologic salt solution) (physiologic sodium chloride solution) a 0.9 per cent solution of sodium chloride and water; it is isotonic, i.e., of the same osmotic pressure as blood serum. It is sometimes given intravenously to replace lost sodium and chloride.
Physiology (/ Ë f Éª z i Ë É l É dÊ i /; from Ancient Greek ÏÏÏÎ¹Ï (physis), meaning 'nature, origin', and -Î»Î¿Î³Î¯Î± (-logia), meaning 'study of') is the scientific study of normal mechanisms, and their interactions, which works within a living system.