Master biology, chemistry, anatomy & more with lessons, simulations, flashcards, and curated research β designed for future physicians.
Spaced repetition system across 5 subject decks with 90+ cards.
10 simulations: ECG, DNA, neurons, enzymes, blood, lungs & more.
9 in-depth lessons with diagrams from Biology to Medical Imaging.
Spaced repetition: rate each card to schedule optimal review. Cards rated Again appear sooner; Easy cards are spaced further apart.
10 real-time simulations β adjust parameters and watch biology, chemistry, and physiology come alive.
ECG (Electrocardiogram) records heart electrical activity. P wave = atrial depolarization β QRS complex = ventricular depolarization (big spike) β T wave = repolarization. Normal: 60β100 BPM. Below 60 = bradycardia; above 100 = tachycardia.
DNA Double Helix: Two antiparallel strands. Base pairs: AβT (2 H-bonds) and GβC (3 H-bonds). Step through phases to see replication.
Action Potential: When stimulus exceeds threshold (~β55 mV), NaβΊ channels open β depolarization to +40 mV β KβΊ channels open β repolarization β hyperpolarization β return to β70 mV resting. Click Fire!
Pulmonary Ventilation: Normal rate: 12β20 breaths/min. Inhalation: diaphragm contracts β lung volume β β air rushes in. Exhalation: diaphragm relaxes. Tidal volume ~500 mL. Oβ absorbed; COβ exhaled at alveoli.
Normal Blood Smear: RBCs (biconcave discs) maximize Oβ exchange. WBCs (larger, with nuclei) defend against infection. Platelets are small clotting fragments. Normal RBC: 4.5β5.5 million/Β΅L; WBC: 4,500β11,000/Β΅L.
Cell Division (Mitosis): Produces two genetically identical daughter cells. Critical for growth, repair, and replacement. Click phases or Auto Play to animate the full cycle.
Michaelis-Menten Kinetics: v = (Vmax Γ [S]) / (Km + [S]). Km = substrate concentration at Β½ Vmax (lower = higher affinity). Vmax = maximum reaction velocity. The orange line shows current [S] on the curve. Drag sliders to explore!
Pharmacokinetics (ADME): Shows plasma drug concentration over time. IV: immediate peak. Oral: absorption phase (Tmax) before peak. Drug is eliminated with a half-life β concentration drops by 50% every tΒ½. Therapeutic window shown in green zone.
Bacterial Growth Curve: 4 phases β Lag (adaptation), Log/Exponential (rapid division), Stationary (birth rate = death rate), Decline (nutrients depleted). Add antibiotic to see inhibitory effect on growth.
Epithelial Tissue: Lines body surfaces and cavities. Simple columnar epithelium (shown) is found in the intestinal lining and is specialized for absorption and secretion. Cells are tall, closely packed with basally positioned nuclei.
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