What's meant by a diurnal rhythm ? And accordingly, How can I solve the following physiology MCQ?
I have been preparing for my final physiology exam and I found this MCQ :-
Which hormone exhibits a diurnal rhythm in its secretion ?
a) ACTH
b) Adrenaline
c) Aldosterone
d) Parathyroid hormone
Can anybody help me understand that medical term and solve this MCQ ?
Thanks in advance.
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