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


A

Anatomy & Physiology

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