Hi , as per your query i would like to tell you that you don't need to take maths as your core subject in order to get admission in bsc in physiology . For this stream you shouldpass  10+2 or equivalent examination with Physics, Chemistry and Biology as subjects studied at an intermediate level. Some reputed colleges and institutes demand a minimum of 50% marks in 10+2 as qualifyingcriteriato secure admission in this degree course.
Hope this helps