National Journal of Physiology is a periodical publication intended for reporting novel research, thereby facilitating the progression of physiological science.  It is an in-house journal of the Association of Physiologists of Tamilnadu, which is one of the top regional registered Association doing yeoman service to all the basic medical science departments and physiologists in particular across all South Indian States. Physiologists are constantly trying to answer key questions in areas ranging from the functions of single cell to the interactions between human populations and our environment here on earth, the moon, and beyond.