Question 1

During which week of embryonic development does the vascular system first appear, and what is the primary reason for its emergence?

Accepted Answer

Week 3; because the embryo can no longer satisfy nutritional needs by diffusion alone

Question 2

Which embryonic structure gives rise to the cardiac muscle and connective tissue of the heart?

Accepted Answer

Splanchnic mesoderm

Question 3

What is the function of the intraembryonic coelom during early cardiovascular development?

Accepted Answer

It becomes the body cavities, including pericardial, pleural, and peritoneal cavities

Question 4

Which of the following best describes the fate of the right and left vitelline veins during embryonic development?

Accepted Answer

The left degenerates, and the right becomes the hepatic portal system and part of the inferior vena cava

Question 5

Which process is responsible for the formation of the atrioventricular canals and contributes to the development of the mitral and tricuspid valves?

Accepted Answer

Fusion of endocardial cushions

Question 6

A newborn is diagnosed with a patent foramen ovale (PFO). What is the most likely consequence if left untreated and pulmonary hypertension develops in adulthood?

Accepted Answer

Increased right-to-left shunt, leading to systemic hypoxemia

Question 7

Which embryonic event is primarily responsible for establishing the left-right asymmetry of the heart?

Accepted Answer

Gastrulation and the establishment of laterality

Question 8

What is the main function of the ductus arteriosus in fetal circulation?

Accepted Answer

To connect the pulmonary artery to the descending aorta, bypassing the fetal lungs

Question 9

Which of the following is a direct derivative of the 6th aortic arch in human embryology?

Accepted Answer

Right and left pulmonary arteries and the ductus arteriosus (left)

Question 10

A patient is found to have dextrocardia without situs inversus. Which embryological process most likely failed?

Accepted Answer

Correct establishment of laterality during gastrulation

Question 11

Which of the following best explains why the foramen ovale closes after birth?

Accepted Answer

Decrease in pulmonary vascular resistance increases left atrial pressure, pushing the septum primum against the septum secundum

Question 12

Which structure forms the smooth-walled part of the adult left atrium?

Accepted Answer

Primordial pulmonary vein

Question 13

A neonate is diagnosed with a membranous ventricular septal defect (VSD). Which embryological structures failed to fuse properly?

Accepted Answer

Right and left bulbar ridges and the endocardial cushions

Question 14

Which of the following is a correct sequence of events in heart tube development?

Accepted Answer

Formation of endocardial tubes → fusion into a single tube → looping → chamber partitioning

Question 15

Which of the following best describes the fate of the ductus venosus after birth?

Accepted Answer

It becomes the ligamentum venosum

Question 16

What is the clinical significance of the crista terminalis in the adult heart?

Accepted Answer

It separates the smooth and trabeculated parts of the right atrium

Question 17

Which of the following arteries is derived from the vitelline arteries during embryonic development?

Accepted Answer

Celiac artery

Question 18

A newborn with persistent truncus arteriosus will most likely have which of the following associated defects?

Accepted Answer

Ventricular septal defect

Question 19

Which embryonic structure is responsible for forming the central tendon of the diaphragm?

Accepted Answer

Septum transversum

Question 20

Which of the following best describes the role of neural crest cells in heart development?

Accepted Answer

They contribute to the formation of the aorticopulmonary septum and endocardial cushions

Cardiovascular Development: Embryology and Early Circulation

Study Guide - Practice Questions

Study Guide - Flashcards