#1
Which structure divides the left and right sides of the heart?
Interventricular septum
ExplanationSeparates ventricles, ensuring separate blood circulation.
#2
Which of the following is not a congenital heart defect?
Aortic stenosis
ExplanationA condition causing narrowing of the aortic valve, not congenital.
#3
Which vessel carries oxygenated blood from the lungs to the heart?
Pulmonary vein
ExplanationTransports oxygen-rich blood from lungs to left atrium.
#4
Which valve prevents the backflow of blood from the left ventricle into the left atrium?
Mitral valve
ExplanationEnsures one-way flow from left ventricle to left atrium.
#5
Which vessel carries deoxygenated blood from the body to the heart?
Inferior vena cava
ExplanationReturns deoxygenated blood from lower body to right atrium.
#6
Which valve prevents the backflow of blood from the right ventricle into the right atrium?
Tricuspid valve
ExplanationMaintains unidirectional flow from right ventricle to right atrium.
#7
Which fetal shunt allows blood to bypass the fetal liver?
Ductus venosus
ExplanationDirects oxygen-rich blood from umbilical vein to inferior vena cava.
#8
Which congenital heart defect is characterized by a 'boot-shaped' heart on X-ray?
Tetralogy of Fallot
ExplanationCombination of heart defects leading to distinctive heart shape.
#9
Which of the following is not a symptom of congenital heart disease in infants?
Bradycardia
ExplanationNot typically associated with congenital heart defects in infants.
#10
Which embryonic structure forms the cardiac jelly during heart development?
Endocardium
ExplanationInner layer of heart tube contributing to cushioning substance.
#11
Which of the following is not a characteristic of Tetralogy of Fallot?
Overriding aorta
ExplanationTypically involves pulmonary stenosis, VSD, right ventricular hypertrophy.
#12
Which signaling molecule is crucial for endothelial-to-mesenchymal transformation during heart development?
Transforming growth factor beta (TGF-β)
ExplanationRegulates cell differentiation, migration during heart morphogenesis.
#13
What is the primary embryonic structure that gives rise to the cardiovascular system?
Mesoderm
ExplanationMiddle germ layer forming heart and blood vessels during development.
#14
Which of the following is a risk factor for congenital heart defects?
All of the above
ExplanationVarious factors including genetics, maternal illness, and environmental factors.
#15
Which condition is characterized by a persistent opening between the aorta and pulmonary artery after birth?
Patent ductus arteriosus
ExplanationFailure of fetal shunt closure, leading to abnormal blood flow.
#16
Which of the following is not a cause of acquired heart defects?
Genetic predisposition
ExplanationAcquired defects result from factors such as infection, injury, not genetics.
#17
Which condition is characterized by the narrowing of the aorta, causing increased blood pressure in the upper body?
Coarctation of the aorta
ExplanationConstriction of aorta leading to hypertension in upper body.