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What's meant by a diurnal rhythm ? And accordingly, How can I solve the following physiology MCQ?

Asked by NourElhoda2262002 (5points) July 8th, 2021

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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