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Questions and Answers
During early heart development, what structural change allows the embryonic ventricle to move to the right of the midline?
During early heart development, what structural change allows the embryonic ventricle to move to the right of the midline?
- Rapid longitudinal growth of the cardiac tube. (correct)
- Expansion of the venous channels.
- Contraction of the arterial trunks.
- Formation of the atrioventricular canal.
What is the origin of the right and left atria during the early stages of heart development?
What is the origin of the right and left atria during the early stages of heart development?
- The interventricular groove.
- The truncus arteriosus.
- Lateral circulations. (correct)
- The bulbo conus.
Which structure does the embryonic right ventricular region (bulbo conus) directly communicate with during early heart development?
Which structure does the embryonic right ventricular region (bulbo conus) directly communicate with during early heart development?
- The interventricular groove.
- The left ventricle.
- The right atrium.
- The truncus arteriosus. (correct)
What is the crucial separating structure in partitioning the atria and ventricles?
What is the crucial separating structure in partitioning the atria and ventricles?
What is the direct consequence of the atrio-ventricular groove constricting the atrio-ventricular canal during heart development?
What is the direct consequence of the atrio-ventricular groove constricting the atrio-ventricular canal during heart development?
During septal development, what is the immediate effect of the interatrial septum growing towards the endocardial cushions?
During septal development, what is the immediate effect of the interatrial septum growing towards the endocardial cushions?
What is the primary function of the foramen secundum during heart development?
What is the primary function of the foramen secundum during heart development?
What role does the septum primum play in fetal heart circulation?
What role does the septum primum play in fetal heart circulation?
Which combination of structures partitions the common atrio-ventricular canal?
Which combination of structures partitions the common atrio-ventricular canal?
What structure is formed by the fusion of ridges that spiral down the truncus arteriosus?
What structure is formed by the fusion of ridges that spiral down the truncus arteriosus?
Endocardial tissue from which structures contributes to the obliteration of the interventricular foramen?
Endocardial tissue from which structures contributes to the obliteration of the interventricular foramen?
How many degrees does the aortic pulmonary septum spiral to align with the superior margin of the interventricular septum?
How many degrees does the aortic pulmonary septum spiral to align with the superior margin of the interventricular septum?
In the final structure of the heart, where does blood from the left ventricle enter and pass in relation to the pulmonary artery?
In the final structure of the heart, where does blood from the left ventricle enter and pass in relation to the pulmonary artery?
Where does blood from the right ventricle enter, and how does it pass in relation to the aorta in the final heart structure?
Where does blood from the right ventricle enter, and how does it pass in relation to the aorta in the final heart structure?
During fetal circulation, where does blood from the superior and inferior vena cava flow after entering the heart?
During fetal circulation, where does blood from the superior and inferior vena cava flow after entering the heart?
During fetal circulation, what is the primary route taken by the majority of blood ejected into the pulmonary artery?
During fetal circulation, what is the primary route taken by the majority of blood ejected into the pulmonary artery?
What physiological condition limits blood flow into the pulmonary arteries during fetal circulation?
What physiological condition limits blood flow into the pulmonary arteries during fetal circulation?
How does oxygenated blood from the placenta reach the left atrium in fetal circulation?
How does oxygenated blood from the placenta reach the left atrium in fetal circulation?
Which vessels are primarily supplied with oxygenated blood in fetal circulation after it passes through the left ventricle?
Which vessels are primarily supplied with oxygenated blood in fetal circulation after it passes through the left ventricle?
What happens to pulmonary blood flow immediately after delivery and lung inflation?
What happens to pulmonary blood flow immediately after delivery and lung inflation?
What is the direct effect of the constriction of the ductus arteriosus after birth?
What is the direct effect of the constriction of the ductus arteriosus after birth?
How is the partitioning of the heart functionally completed after birth?
How is the partitioning of the heart functionally completed after birth?
Which event initiates partition of the heart?
Which event initiates partition of the heart?
Where is the future left ventricle located?
Where is the future left ventricle located?
What structures fuse together, dividing the channel between the atrium and ventricle?
What structures fuse together, dividing the channel between the atrium and ventricle?
What opens before the closure of the foramen primum?
What opens before the closure of the foramen primum?
What structure develops to the right of the septum primum, forming the foramen ovale?
What structure develops to the right of the septum primum, forming the foramen ovale?
Which septum splits the truncus arteriosus and conus region into the aorta and pulmonary artery?
Which septum splits the truncus arteriosus and conus region into the aorta and pulmonary artery?
What structure is obliterated by endocardial tissue from the ventricular septum, endocardial cushions, and the spiral aortic septum?
What structure is obliterated by endocardial tissue from the ventricular septum, endocardial cushions, and the spiral aortic septum?
What structure does a major portion of blood continue through from the pulmonary artery?
What structure does a major portion of blood continue through from the pulmonary artery?
During fetal circulation, via which structure does oxygenated blood from the placenta enter the inferior vena cava?
During fetal circulation, via which structure does oxygenated blood from the placenta enter the inferior vena cava?
What factor leads to increased pressure in the left atrium, causing the valvula to press over the foramen ovale, after delivery?
What factor leads to increased pressure in the left atrium, causing the valvula to press over the foramen ovale, after delivery?
What causes the right ventricle output to be diverted into the pulmonary circulation after birth?
What causes the right ventricle output to be diverted into the pulmonary circulation after birth?
Which route does the blood take from the left ventricle, relating to the position of the pulmonary artery?
Which route does the blood take from the left ventricle, relating to the position of the pulmonary artery?
Prior to the formation of the four-chambered heart, which of the following structures does not require partitioning?
Prior to the formation of the four-chambered heart, which of the following structures does not require partitioning?
During fetal circulation, why is it important that oxygenated blood from the placenta primarily supplies the brain?
During fetal circulation, why is it important that oxygenated blood from the placenta primarily supplies the brain?
Why must the foramen ovale close after birth?
Why must the foramen ovale close after birth?
What is the purpose of blood being shunted away from the lungs through the ductus arteriosus during fetal circulation?
What is the purpose of blood being shunted away from the lungs through the ductus arteriosus during fetal circulation?
Flashcards
Early Heart Tube
Early Heart Tube
The heart begins as a simple tube anchored by arterial trunks at one end and venous channels at the other.
Ventricular Looping
Ventricular Looping
The embryonic ventricle bends into a loop to the right of the midline.
Atria Formation
Atria Formation
Lateral circulations develop into the right and left atria.
Atrio-ventricular Groove
Atrio-ventricular Groove
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Atrio-ventricular Canal
Atrio-ventricular Canal
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Endocardial Cushions
Endocardial Cushions
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Interventricular Septum
Interventricular Septum
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Foramen Secundum
Foramen Secundum
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Septum Secundum
Septum Secundum
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Septum Primum
Septum Primum
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Interventricular Foramen
Interventricular Foramen
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Spiral Septum
Spiral Septum
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Ductus Arteriosus
Ductus Arteriosus
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Foramen Ovale
Foramen Ovale
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Pulmonary Vascular Resistance
Pulmonary Vascular Resistance
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