A Class Project Required a Student Nurse to Make Hourly

Multiple Choice

A class project required a student nurse to make hourly records of her own blood pressure and body temperature over a 30-day period.When the data were graphed,it became clear that these readings changed in a predictable way on a daily basis.The reason for this regularity is that many physiological processes are

A) determined by subconscious expectations.
B) governed by circadian rhythms.
C) controlled by daily lunar cycles.
D) correlated with lunar rotation.