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|AnswerEExp=Option E is not characteristic of hematopoiesis in any organ.
|AnswerEExp=Option E is not characteristic of hematopoiesis in any organ.
|EducationalObjectives=Erythropoiesis in the liver typically starts in the fetus at 6 weeks of gestation and continues until birth.
|EducationalObjectives=Erythropoiesis in the liver typically starts in the fetus at 6 weeks of gestation and continues until birth.
|References=First Aid 2014 page 264
|References=First Aid 2014 page 270.
|RightAnswer=C
|RightAnswer=C
|WBRKeyword=Erythropoiesis, Fetal erythropoiesis, Blood, Development, Fetus, Liver
|WBRKeyword=Erythropoiesis, Fetal erythropoiesis, Blood, Development, Fetus, Liver
|Approved=Yes
|Approved=Yes
}}
}}

Revision as of 23:32, 15 August 2015

 
Author [[PageAuthor::Rim Halaby, M.D. [1] (Reviewed by Yazan Daaboul, M.D.)]]
Exam Type ExamType::USMLE Step 1
Main Category MainCategory::Embryology
Sub Category SubCategory::Hematology
Prompt [[Prompt::The concentrations of different types of hematopoietic stem cells are measured in various organs extracted from aborted fetuses. Shown below is an image that depicts hematopoiesis in various organs throughout fetal life and adulthood. Which of the following most likely represents hematopoiesis in the liver?

]]

Answer A AnswerA::A
Answer A Explanation [[AnswerAExp::Option A depicts erythropiesis in the bone marrow, which typically starts at 18 weeks gestation and continues throughout adulthood.]]
Answer B AnswerB::B
Answer B Explanation [[AnswerBExp::Option B depicts erythropoiesis in the spleen, which typically occurs between 10 weeks and 28 weeks of gestation.]]
Answer C AnswerC::C
Answer C Explanation [[AnswerCExp::Option C depicts erythropoiesis in the liver, which typically starts in the fetus at 6 weeks of gestation and continues until birth.]]
Answer D AnswerD::D
Answer D Explanation [[AnswerDExp::Option D depicts erythropoiesis in the yolk sac, which typically starts in the fetus at 3 weeks of gestation and continues until 8 weeks of gestation.]]
Answer E AnswerE::E
Answer E Explanation AnswerEExp::Option E is not characteristic of hematopoiesis in any organ.
Right Answer RightAnswer::C
Explanation [[Explanation::The site of erythropoiesis varies according to the age of the fetus. Fetal erythropoiesis occur in the following organs:


Shown below is an image that depicts erythropoiesis in fetuses and adults.
Fetal erythropoiesis
Educational Objective: Erythropoiesis in the liver typically starts in the fetus at 6 weeks of gestation and continues until birth.
References: First Aid 2014 page 270.]]

Approved Approved::Yes
Keyword WBRKeyword::Erythropoiesis, WBRKeyword::Fetal erythropoiesis, WBRKeyword::Blood, WBRKeyword::Development, WBRKeyword::Fetus, WBRKeyword::Liver
Linked Question Linked::
Order in Linked Questions LinkedOrder::