NBME CBSE TEST EXAM 226 QUESTIONS AND ANSWERS 2026/2027 usmle step 1 MEDICAL EXAMINATION

NBME CBSE TEST EXAM 226 QUESTIONS AND
ANSWERS 2026/2027 (usmle step 1)MEDICAL EXAMINATION
Bulbus cordis - Smooth parts (outflow tract) of left and right
ventricles
endocardial cushions - Atrial septum, membranous interventricular
septum; AV and semilunar valves
neural crest
left horn of the sinus venosus - coronary sinus
posterior, sub cardinal, and supra cardinal veins - IVC
Right common cardinal vein and right anterior cardinal vein - SVC
Right horn of sinus venosus - Smooth part of right atrium (sinus
venarum)
Patent foramen ovale - failure of septum primum and septum
secundum to fuse after birth
Transposition of the great vessels
Tetralogy of Fallot
Persistent truncus arteriosus - Conotruncal abnormalities
associated with failure of neural crest cells to migrate
ductus venosus - connects the umbilical vein to the inferior vena
cava, bypassing the liver
becomes ligamentum venosum
phrenic nerve - innervates the diaphragm and pericardium