ACTH level is highest during:: (A) Early morning, (B) Evening, (C) Afternoon, (D) Night
Answer is A. A i.e. Early morningACTH level is highest during early morningQ. About 75% of daily output occurs between 4 AM and 10 AM.Secretion is least in the evening. The biological clock responsible for diurnal variation of ACTH is located in suprachiasmatic nuclei of hypothalamusQ.