Abstract:
The neurofunctional system, which receives a photoperiod, is a photoperiodic brain system. As a part of
chronoperiodic system of organism it is involved in perception and transfer of information about the main external
Zeitgeber to the peripheral tissues. Such role of photoperiod
ic system allows it not only synchronize the chronorhythms
of different somatic and visceral functions, but also realize the coordination and the modulation of adaptation
mechanisms to the stressors influence such as an acute hypoxia. It has been esta
blished that the pineal gland played one
of the most important roles in the whole system of the antihypoxic defence of the organism, realizing such defence
according to the duration of the photoperi
od by means of the action of its hormone
s of indole (melatonin) and peptide
nature.
