Diurnal Rhythms Are

Multiple Choice

Diurnal rhythms are

A) are inherent cyclical peaks and ebbs of hormone secretion that are a function of time and are entrained to the 24-hour light-dark cycle
B) are important in maintaining hormone levels at a relatively constant set point no matter the time of day
C) mainly associated with adrenal hormones
D) are all of the above
E) none of the above