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Questions and Answers
During which week is the most sensitive phase of cardiac development?
During which week is the most sensitive phase of cardiac development?
- Week 2
- Week 3 (correct)
- Week 1
- Week 4
What is the composition of the tubes that form the heart prior to Week 3?
What is the composition of the tubes that form the heart prior to Week 3?
- Endocardium and myocardium (correct)
- Endocardium and epicardium
- Epicardium and pericardium
- Pericardium and myocardium
What happens to the heart tubes at 21-33 days of development?
What happens to the heart tubes at 21-33 days of development?
- They separate into two distinct tubes
- They connect with the sinus venosus
- They fuse into a single endocardial heart tube (correct)
- They form the aortic arch system
What does the sinus venosus ultimately form?
What does the sinus venosus ultimately form?
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Where does the heart tube connect with the developing aortic arch system?
Where does the heart tube connect with the developing aortic arch system?
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Study Notes
Cardiac Development
- The most sensitive phase of cardiac development occurs during Week 3.
Heart Tube Formation
- Prior to Week 3, the tubes that form the heart are composed of mesoderm and endoderm.
Heart Tube Development
- At 21-33 days of development, the heart tubes fuse and form a single tube.
Sinus Venosus
- The sinus venosus ultimately forms the sinoatrial node, atrial tissue, and the coronary sinus.
Heart and Aortic Arch System
- The heart tube connects with the developing aortic arch system via the aortic arches.
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