During the third week of development, the blastocyst undergoes a variety of differentiation processes responsible for the formation of the gastrula and, eventually, the embryo. This differentiation creates cell lineages that eventually become a variety of body systems. What cell lineage, present at this date, is responsible for the formation of the liver?
ANeuroectoderm
BSyncytiotrophoblasts
CEctoderm
DEndoderm
EMesoderm
A 27-year-old woman, who recently immigrated from Bangladesh, presents to her primary care physician to discuss birth control. During a review of her past medical history, she reports that as a child she had a recurrent sore throat and fever followed by swollen and aching hip and knee joints. These symptoms returned every season and were never treated but went away on their own only to return with the next typhoon season. When asked about any current complaints, the patient says that she sometimes has shortness of breath and palpitations that do not last long. A physical exam is performed. In which of the auscultation sites will a murmur most likely be heard in this patient?
APoint 5
BPoint 4
CPoint 2
DPoint 3
EPoint 1
A 56-year-old man is brought to the emergency department 25 minutes after the sudden onset of severe pain in the middle of his chest. He describes the pain as tearing in quality; it radiates to his jaw. He has hypertension. He has smoked one pack of cigarettes daily for the 25 years. Current medications include enalapril. His blood pressure is 154/95 mm Hg in his right arm and 181/105 mm Hg in his left arm. A CT scan of the chest is shown. The structure indicated by the arrow is a derivative of which of the following?
ARight horn of sinus venosus
BPrimitive atrium
CRight common cardinal vein
DTruncus arteriosus
EBulbus cordis
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