Cardiac Development Quiz

The heart starts as two separate tubes, one on each side of the midline, in the head region of the embryo.

During week 3, the two heart tubes fuse together to form a single continuous tube. This tube then develops specific regions.

The caudal end of the fused heart tube, formed by the union of veins, matures into crucial structures like the superior and inferior vena cava.

The bulbus cordis, a region of the heart tube, develops into the apical portion of the right ventricle and the outflow tracts for both ventricles.

The truncus arteriosus, a vital part of the heart tube, gives rise to the major arteries supplying blood to the body and lungs.

A muscular wall that forms between the two ventricles during the sixth week of fetal development.

A temporary opening between the right and left atria that allows blood to bypass the fetal lungs.

The point where the aorta attaches to the heart.

Two cushions of tissue that fuse to form the atrioventricular valves and help divide the heart into chambers.

During development, the atrioventricular canal shifts to the right, connecting the left atrium to the left ventricle and the right atrium to the right ventricle.

Two separate heart tubes formed during earlier stages of development fuse together to create a single, continuous heart tube.

The heart begins to beat due to muscle contractions. This marks the start of the heart's pumping action.

As the heart grows, it folds upon itself, taking on an S-shaped form.

A thin wall begins to form within the primitive atrium, dividing it into two chambers.

A connection exists between the sinus venosus - a structure responsible for receiving blood from the body - and the primitive atrium, allowing blood flow between the two.

As the atrioventricular canal is divided by endocardial cushions, the mitral valve - controlling blood flow from left atrium to left ventricle - and tricuspid valve - controlling blood flow from right atrium to right ventricle - are formed.

A small ridge appears on the primitive ventricle, which will eventually become the ventricular septum, dividing the ventricle into left and right chambers.

The closure of the foramen ovale, a hole between the atria, occurs at birth when the first breath is taken. This happens because left atrial pressure increases, forcing the septum primum against the septum secundum, closing the opening.

The membranous septum completes the separation of the ventricles by closing the secondary interventricular foramen, ensuring that oxygenated and deoxygenated blood flow is completely separated.

The truncus arteriosus, a vital blood vessel, splits into two important arteries: the aorta and the pulmonary artery. This division is a crucial step in the development of the heart's blood supply system.

The truncus arteriosus spirals during development, creating a twisted arrangement that ensures the correct connection of the aorta and pulmonary artery to the ventricles.

The truncus arteriosus, once a single structure, divides into the aorta and the pulmonary artery, creating distinct pathways for oxygenated and deoxygenated blood.

A thin membrane in the developing heart that helps divide the atria. It closes the opening called ostium primum.

A secondary opening that forms above the septum primum, allowing blood to flow between the atria.

Develops to the right side of the septum primum and helps complete the division of the atria.

The area where the sinoatrial node is located and shifts to the right side during development, connecting only to the right atrium.

This orifice is how blood enters the heart and forms at the base of the sinoatrial orifice.

The lower chamber of the heart, where the ventricles grow inferiorly from the bulbus cordis.

Small pockets in the heart wall that extend from the bulbus cordis and primitive ventricle, contributing to the ventricles.

The region where the heart starts its development and is part of the right ventricle.

The circulatory system of a fetus, where blood flow bypasses the lungs due to their fluid-filled state.

A blood vessel connecting the pulmonary artery to the aorta in a fetus, allowing blood to bypass the lungs.

The organ responsible for providing oxygen and nutrients to the fetus and removing waste products.

The only vessel carrying oxygen-rich blood in the fetus, transporting blood from the placenta to the fetal heart.

Blood flow in the fetus primarily mixes oxygen-rich and oxygen-depleted blood due to the bypassing of the lungs.

The pressure inside the fetal heart, where the right side has higher pressure than the left side.

The primary function of the fetal circulatory system, ensuring adequate oxygenation and nutrient delivery to the developing fetus despite the lungs being non-functional.

The ductus arteriosus is a blood vessel that connects the pulmonary artery to the aorta in the fetus, allowing blood to bypass the lungs.

The foramen ovale is a temporary opening between the right and left atria of the heart in the fetus, allowing blood to bypass the fetal lungs.

The ductus venosus is a blood vessel that connects the umbilical vein to the inferior vena cava in the fetus, allowing blood to bypass the liver.

The umbilical cord contains three blood vessels: two umbilical arteries and one umbilical vein.

The placenta is the organ responsible for providing oxygen and nutrients to the fetus and removing waste.

The first breath of a newborn causes the lungs to expand and fill with air, increasing pulmonary blood flow and closing the foramen ovale.

The closure of the ductus arteriosus is almost immediate after birth due to muscular contractions triggered by higher oxygen levels.

The umbilical arteries and vein close shortly after birth due to contractions of smooth muscles, triggered by rising oxygen levels.