Biological Rhythms - Infradian

Infradian Rhythm -  A biological rhythm with a frequency of less than one cycle in 24 hours. (Lasts longer than 24 hours) E.g Menstrual cycle 

Menstrual cycle 
The cycle refers to the first day of an individuals period, shedding of the womb lining and the day before the next period. 
- Typical cycle is 28 days 
- During each cycle 
Rising levels of oestrogen cause the ovary to develop and release an egg. (Ovulation) 
After ovulation, progesterone helps lining of womb to grow thicker (to…