The Calgary Guide to Understanding Disease @TheCalgaryGuide
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Feedback Loop: Prolactin (PRL)
 • PRL levels exhibit diurnal, menstrual, and age-related variation
 • TRH has
Feedback Loop: Prolactin ... PRL secretion Prolactin ... Lactation #Prolactin ... #FeedbackLoop #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
sudden +++ positive feedback ... negative to positive feedback ... MenstrualCycle #OvarianCycle ... pathophysiology #Ovulation #endocrinology
Feedback Loop: Growth Hormone (GH)
Growth Hormone:
 • Liver -> GHR activates JAK-STAT pathway -> Incr IGF1
Feedback Loop: Growth ... metabolic abn #GrowthHormone ... #FeedbackLoop #endocrinology