new_n_lost
Politically InCorrect
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During embryological development, hematopoiesis occurs in different organs at different times.
Which of the following are the correct organs, in the correct sequence, at which hematopoiesis occurs embryologically?
A. Amnion, yolk sac, placenta, bone marrow
B. Placenta, liver and spleen, yolk sac, bone marrow
C. Placenta, spleen and lymphatic organs, bone marrow
D. Yolk sac, bone marrow, liver and spleen
E. Yolk sac, liver, spleen and lymphatic organs, bone marrow
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| mytime
Kick my butt!
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now u throw a catch22 !!!!!!!! I think this one thru for a mt. 
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| mytime
Kick my butt!
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OK I go for E. After a lot of Brain sctaching!
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| silver
Forum Guru
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E. Yolk sac, liver, spleen and lymphatic organs, bone marrow
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| Jackofknives
Ipwnpoker.com
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yea, placenta and amnion have nothing to do with hematopoiesis
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| new_n_lost
Politically InCorrect
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mytime wrote:OK I go for E. After a lot of Brain sctaching!
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| new_n_lost
Politically InCorrect
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The correct answer is E.
By the third week of development, hematopoiesis begins in the blood islands of the yolk sac. Beginning at 1 month of age and continuing until 7 months of age, blood elements are also formed in the liver. Hematopoiesis occurs in the spleen and lymphatic organs between 2 and 4 months, and in the bone marrow after 4 months.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| edie
I can, and I will.
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Remember that the "Young Liver Synthesizes Blood" (from FA)
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