20 results
Menstrual Cycle Physiology: The Hypothalamic-Pituitary-Ovarian Axis
Estrogen, when released:
 • Negatively feeds back on the hypothalamus and
endocrinology #feedback
Regulation of GFR
Physiologically, GFR is auto-regulated very precisely with changes in the mean arterial pressure (MAP)
neuro-hormonal feedback ... Tubuloglomerular feedback ... Neuro-hormonal feedback
Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
sudden +++ positive feedback ... negative to positive feedback
Feedback Loop: Prolactin (PRL)
 • PRL levels exhibit diurnal, menstrual, and age-related variation
 • TRH has
Feedback Loop: Prolactin
Macula Densa Pathway - Physiological Pathways, Feedback Loops, and Pharmacological Regulation of the Renin-Angiotensin-System

#MaculaDensa #Pathophysiology #Nephrology
Physiological Pathways, Feedback
Considerations for Crystalloids - 0.9% NS vs LR vs Plasma-Lyte
 - Causes hyperkalemia?
 - Safe to
per @kidney_boy feedback
Feedback Loop: Growth Hormone (GH)
Growth Hormone:
 • Liver -> GHR activates JAK-STAT pathway -> Incr IGF1
Feedback Loop: Growth
Glucocorticoid-Induced Osteoporosis: Pathogenesis and Clinical Findings

 • Negative feedback on hypothalamus/pituitary, Decreasing ACTH -> Decr Sex
• Negative feedback
Calcium homeostasis is a process controlled by chiefly by hormones vitamin D and PTH. 
Vitamin D
classical negative feedback
Limbic system
Medial/rostral hypothalamus
Lateral hypothalamus
Hypothalamic neurosecretion
ADH
Autonomic centers
Signal generator
CRH
Negative feedback
Sympathetic nervous system
Anterior pituitary
ACTH
Adrenal medulla
Adrenal cortex
#Cortisol
#Epinephrine (norepinephrine)
Response to signal
CRH Negative feedback