Mnemonic 1: WBC Abundance Order
"Never Let Monkeys Eat Bananas"
- Never = Neutrophils (60-65%)
- Let = Lymphocytes (20-25%)
- Monkeys = Monocytes (6-8%)
- Eat = Eosinophils (2-3%)
- Bananas = Basophils (0.5-1%)
Mnemonic 2: Conducting System Sequence
"SA Athletes Are Very Brave, Held by Pure spirit"
- SA = Sinoatrial node
- Athletes = Atrioventricular node
- Are Very = (skip)
- Brave = Bundle of His
- Held = His branches (left + right)
- Pure = Purkinje fibres Simpler version: SAN → AVN → Bundle → Purkinje ("SAB-P" or "SA-AV-Bundle-Purkinje")
Mnemonic 3: ECG Waves
"P-QRS-T = Atrial Depol, Ventricular Depol, Ventricular Repol" "Please Quietly Rest So Tired" (P-Q-R-S-T)
- P = atrial depolarization
- QRS = ventricular depolarization
- T = ventricular repolarization
Mnemonic 4: Blood Group Antibodies (Rule)
"You make antibodies AGAINST what you DON'T HAVE"
- Group A has no B antigen → makes ANTI-B antibodies
- Group B has no A antigen → makes ANTI-A antibodies
- Group AB has both → makes NOTHING (no foreign ABO antigens)
- Group O has neither → makes BOTH anti-A and anti-B antibodies
Mnemonic 5: Universal Donor/Recipient
"O gives to Others; AB Accepts from All Beings"
- O = O-neg = universal DONOR (zero antigens = zero rejection)
- AB = AB-pos = universal RECIPIENT (zero antibodies = zero rejection of incoming blood)
Mnemonic 6: Cardiac Cycle Timing
"0.1 for Atria, 0.3 for Ventricles, 0.4 for DIASTOLE = 0.8 TOTAL" Rhyme: "One-tenth, three-tenth, four-tenth, done — eight-tenth for every heartbeat run"
Mnemonic 7: Plasma Proteins
"A-G-F for Pressure-Immunity-Clotting"
- Albumin = Artery pressure (osmotic pressure)
- Globulins = Guards
- Fibrinogen = Fixes wounds (clotting → fibrin)
Mnemonic 8: Basophil Secretions
"Basophils = Both Histamine and Heparin (two H's)"
- HistaHamine + Heparin = two H's from basophils
- Remember: LEAST abundant but two key secretions