At what time of the day GH levels are highest:September 2007: (A) 2 hours after sleep, (B) 2 hours before sleep, (C) Evening, (D) Early morning
Answer is A. Ans. A: 2 hours after sleepGH is synthesized and secreted from the anterior pituitary gland in a pulsatile manner throughout the day; surges of secretion occur at 3- to 5-hour intervals. The largest and most predictable of these GH peaks occurs about 2 hours of deep sleep, otherwise there is wide variation between days and individuals.