Key Concepts
Overview & Normal Structure
The umbilical cord connects the fetus to the placenta, measuring approximately 50โ60 cm in length and 1โ2 cm in diameter at term. It contains three vessels: two umbilical arteries (carry deoxygenated blood and waste from fetus to placenta) and one umbilical vein (carries oxygenated, nutrient-rich blood from placenta to fetus). The vessels are embedded in Wharton's jelly (gelatinous connective tissue) which cushions and protects them. Covered by amnion. On the exam, writers often pair stable-sounding options with unstable dataโnotice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent harm and matches orders for the role you were given. Train yourself to state the primary risk in one short phrase before you read the options so distractors do not rewrite your priority list. On the exam,...