🧠 Step 8 — Student Memory Support
This final section is designed for rapid revision, memory strengthening, and last-day exam preparation. Use it after completing the topic to recall high-yield facts quickly.
🎯 How to Use This Section
- Revise flashcards for quick recall.
- Use mnemonics to remember lists.
- Review memory tables for comparison-based questions.
- Read clinical hooks before exams.
- Mark the topic complete after revision.
🃏 1️⃣ High-Yield Flashcards
Which pathway is the only ATP source in RBCs?
Glycolysis.
Which enzyme converts pyruvate into acetyl-CoA?
Pyruvate dehydrogenase (PDH) complex.
Which vitamin is essential for PDH activity?
Vitamin B1 (Thiamine).
Which metabolite accumulates in PDH deficiency?
Lactate.
Which pathway produces NADPH in RBCs?
Pentose phosphate pathway.
Which enzyme deficiency causes oxidative hemolysis?
G6PD deficiency.
Which molecule protects RBCs from oxidative stress?
Reduced glutathione.
Which organ mainly maintains blood glucose during fasting?
Liver.
Which glycogen storage disease causes exercise intolerance?
McArdle disease.
Which glycogen storage disease commonly causes fasting hypoglycemia?
Von Gierke disease.
Which transporter is insulin dependent?
GLUT-4.
Which hormone mainly lowers blood glucose?
Insulin.
🧠 2️⃣ Mnemonics
Mnemonic Title:
PDH Cofactors
Mnemonic Word:
“TLC For Nancy”
Meaning:
- T = Thiamine (B1)
- L = Lipoic acid
- C = CoA
- F = FAD
- N = NAD⁺
Mnemonic Title:
Triggers of G6PD Hemolysis
Mnemonic Word:
“FAB”
Meaning:
- F = Fava beans
- A = Anti-malarial / Antibiotic drugs
- B = Bacterial infections
Mnemonic Title:
Functions of Liver Glycogen
Mnemonic Word:
“Liver Loves Fasting”
Meaning:
- Liver glycogen maintains blood glucose during fasting.
📋 3️⃣ Memory Tables
Table 1 — G6PD Deficiency vs Pyruvate Kinase Deficiency
| Feature | G6PD Deficiency | Pyruvate Kinase Deficiency |
|---|---|---|
| Main problem | ↓ NADPH | ↓ ATP |
| Main pathway | Pentose phosphate pathway | Glycolysis |
| Main effect | Oxidative hemolysis | Membrane instability |
| Triggered by stress | Yes | Usually chronic |
| Heinz bodies | Present | Absent |
Table 2 — Hypoglycemia vs Hyperglycemia
| Feature | Hypoglycemia | Hyperglycemia |
|---|---|---|
| Blood glucose | Low | High |
| Major organ affected | Brain | Blood vessels |
| Common symptoms | Sweating, seizures | Polyuria, polydipsia |
| Major hormone issue | Excess insulin | Insulin deficiency/resistance |
| Main danger | Neuroglycopenia | Diabetic complications |
⚡ 4️⃣ Rapid Revision Points
Must Remember:
- RBCs depend completely on glycolysis.
- PDH links glycolysis with TCA cycle.
- PDH deficiency → lactic acidosis.
- G6PD produces NADPH.
- NADPH maintains reduced glutathione.
- G6PD deficiency causes oxidative hemolysis.
- Liver glycogen maintains fasting glucose.
- Muscle glycogen is for muscle use only.
- Hypoglycemia mainly affects the brain.
- Hyperglycemia commonly occurs in diabetes mellitus.
- GLUT-4 is insulin dependent.
- Chronic hyperglycemia damages blood vessels.
🩺 5️⃣ Clinical Memory Hooks
Clinical Hook:
G6PD deficiency → Oxidative stress → Hemolytic anemia
Clinical Hook:
PDH deficiency → Lactate accumulation → Neurological dysfunction
Clinical Hook:
Von Gierke disease → Hepatic glycogen defect → Severe fasting hypoglycemia
Clinical Hook:
McArdle disease → Muscle glycogen breakdown defect → Exercise intolerance
Clinical Hook:
Diabetes mellitus → Insulin deficiency/resistance → Hyperglycemia
6️⃣ Do’s, Don’ts & ⚠️ Common Mistakes
✅ Do’s
- Do remember RBCs lack mitochondria.
- Do connect PDH deficiency with lactic acidosis.
- Do associate G6PD deficiency with oxidative stress.
- Do differentiate liver glycogen from muscle glycogen.
- Do relate insulin with GLUT-4 activity.
❌ Don’ts
- Don’t say RBCs use TCA cycle.
- Don’t confuse NADPH with ATP function.
- Don’t say muscle glycogen maintains blood glucose.
- Don’t confuse G6PD deficiency with iron deficiency anemia.
- Don’t forget brain dependence on glucose.
⚠️ Common Mistakes
- Confusing pyruvate kinase deficiency with G6PD deficiency.
- Forgetting that PDH is mitochondrial.
- Confusing hypoglycemia symptoms with dehydration symptoms.
- Assuming all tissues require insulin for glucose uptake.
- Forgetting that oxidative drugs trigger G6PD hemolysis.