Medical School MD + DO Mastery

A 4-year, board-aligned study system for medical school and licensing exams.

Walk the full Year 1–4 curriculum — foundational sciences, organ-system blocks, clinical clerkships and advanced practice — each with mastery checklists and linked learning resources, plus a dedicated review system for school exams, Shelf/COMAT, USMLE Step 1–3 and COMLEX-USA Levels 1–3.

YEAR 2 SYSTEMS REVIEW - ENDOCRINE / METABOLISM

YEAR 2 | PAGE 48B - FEEDBACK AXES -> DYNAMIC TESTING -> DIABETES / CALCIUM -> PHARMACOLOGY

ENDOCRINE SPINE: HYPOTHALAMUS -> PITUITARY -> TARGET GLAND -> HORMONE EFFECT -> NEGATIVE FEEDBACK. PREDICT THE UPSTREAM / DOWNSTREAM HORMONE PATTERN BEFORE NAMING THE DISEASE; THEN USE DYNAMIC TESTING, EMERGENCY RISK AND THERAPY. D. ENDOCRINE CLOSED-BOOK REVIEW MAP

LANE	MUST RETRIEVE WITHOUT NOTES	HIGH-DISCRIMINATION TRANSFER
Pituitary / feedback	TRH/TSH, CRH/ACTH, GnRH/FSH/LH, GH/IGF-1, prolactin, ADH; receptor/second-messenger logic.	Infer primary gland vs central disease from the direction of upstream/downstream hormones.
Thyroid + adrenal	Synthesis, feedback, Graves/thyroiditis, adrenal insufficiency, cortisol/aldosterone excess, CAH concepts.	Interpret TSH/T4 or ACTH/cortisol/renin/aldosterone pattern first, then attach disease name and test.
Diabetes / metabolic crises	Insulin/glucagon physiology; T1/T2; DKA/HHS; major medication classes; acute and chronic complications.	Use glucose + ketones + pH/HCO3- + osmolality + volume/K pattern to separate emergencies mechanistically.
Calcium / bone	PTH, vitamin D, phosphate, kidney/bone/gut effects; hypo/hyperparathyroid states; osteoporosis/osteomalacia.	Build the Ca-PTH-phosphate-vitamin D pattern before reaching for a memorized diagnosis.
Endocrine pharmacology	Hormone synthesis/receptor targets, replacement/suppression, diabetes drugs, steroid/mineralocorticoid and bone drugs.	Predict effect and toxicity from the normal axis or transporter/receptor being changed.

E. TOP 10 MOST-MISSED SYSTEM CONCEPTS - #4 TO #7

# / CONCEPT	DEEP EXPLANATION	WHY STUDENTS MISS IT	EASIEST CLUE
4. Primary vs central endocrine disease	A target-gland failure produces low target hormone with an appropriately elevated trophic signal; central failure produces an inappropriately low/normal trophic signal. Hormone excess reverses the logic.	Students memorize disease-specific lab pairs instead of deriving them from negative feedback.	Draw three boxes with feedback arrows and ask where the defect sits.
5. Dynamic testing asks whether a control system can	Suppression tests ask whether an excessive axis can be turned down; stimulation tests ask whether a deficient axis can be	The names of tests are memorized without the physiologic question, so results feel arbitrary.	Ask should this hormone suppress, stimulate, or stay
respond	activated. The interpretation depends on what level of the axis should respond.		autonomous?
6. DKA vs HHS is physiology, not two lists	DKA reflects marked insulin deficiency with lipolysis/ketogenesis and high-anion-gap acidosis; HHS has enough insulin to restrain major ketogenesis but not hyperglycemia/osmotic diuresis. Total-body K can be depleted even when serum K is initially normal/high.	Students equate serum potassium with total-body stores and memorize cutoffs without understanding insulin/osmotic shifts.	Separate ketones/acidosis from hyperosmolality/dehydration; then ask where K is, not only what the serum shows.
7. Calcium disorders are a four-variable pattern	PTH, calcium, phosphate and vitamin D/renal function form a linked control system. The key is whether PTH is appropriate for the calcium concentration and what it does to kidney, bone and vitamin D activation.	Single lab values are overlearned, while the physiologic relationship is underlearned.	Start with calcium -> is PTH appropriately up or down?

F. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

RESOURCE	ROLE IN THIS REVIEW
Ninja Nerd - Anterior Pituitary Connection	Pituitary portal system and feedback axes.
Ninja Nerd - Thyroid Hormone Synthesis	Thyroid synthesis, TSH feedback and major drug targets.
Ninja Nerd - Adrenal Gland Overview	Cortisol, aldosterone, androgens and medullary physiology.
Ninja Nerd - Insulin + Glucagon	Fed/fasting integration and pancreatic hormone physiology.
Ninja Nerd - Adrenal Insufficiency	Primary vs central adrenal failure and testing/crisis physiology.
HyGuru - Top NBME Concepts: Endocrinology	Long-form active-recall review for thyroid, calcium, diabetes and adrenal patterns.

F. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

SCHOOL-EXAM GATE	BOARD / COMLEX TRANSFER
• Predict hormone patterns before seeing answer choices. • Explain why a dynamic test should suppress or stimulate.	• Axis -> lab pattern -> disease mechanism -> test/drug. • Treat endocrine emergencies as physiology + urgency questions.
• Solve diabetes, sodium/water and calcium patterns from mechanism. 2026/27 systems-review expanded edition - align with school objectives and verify official exam updates before testing	• Use mixed cases after targeted repair to prove transfer.