a. bloodstream
b. thymus
c. intestines
d. bone marrow
e. spleen
2007-04-08 17:04:52 · 3 answers · asked by M_J 1 in Science & Mathematics ➔ Biology
Bone marrow. In foetuses they can be produced in the spleen.
2007-04-08 17:36:04 · answer #1 · answered by Labsci 7 · 2⤊ 0⤋
d)bone marrow.
in the earliest embryonic stages they are produced in the yolk sac, after the first trimester in the liver and the spleen and finally after birth in the bone marrow of the shaft of the long bones like femur,humerus etc.
the maturation takes place in the thymus and secondarily in the spleen and the lymph nodes.
2007-04-08 22:17:47 · answer #2 · answered by rara avis 4 · 0⤊ 0⤋
you're pertaining to: Haematopoietic stem cells (HSCs) and as Spreedog has observed they originate contained in the bone marrow and are kept contained in the thymus. There are 2 sorts of those NK(organic killer cells) T cells (thymus cells) and B cells (bursa cells).
2016-11-27 20:33:10 · answer #3 · answered by keanum 4 · 0⤊ 0⤋