Physiology is a branch of Biology that deals with the mechanical, physical, biochemical functions of the human body. Now Neurophysiology is  includiing the nervous system and its reactions to these functions. To study to become a NeuroPhysiologisy, you should complete your Masters in Physiology and complete M.Phil in NeuroBiology. Now to study M.Sc in Physiology, you should have studied Physiology as a subject in your graduation. But B.Sc Biology will mot have Physiology as a subject in its curriculum and so you might find it difficult for admission in M.Sc Physiology. Again Psychology also doesn't have Physiology as a subject in its curriculum and so with B.Sc Psychology, you cannot pursue M.Sc Physiology.