Question

Lymphocytes are formed in what organ(s)?
Answer
a. spleen
b. thymus
c. bone marrow
d. spleen and bone marrow
e. thymus and bone marrow

Answer 1

I think it's just bone marrow right?

Answer 2

"Small lymphocytes consist of T cells and B cells." - Wikipedia
This is easily rememberable: T-cells (originates from "T"hymus,) while B-cells (originates from "B"onemarrow.)
So the answer is both Thymus & Bone marrow.

Answer 3

Aren't the T cells matured in the Thymus and not produced there?

Answer 4

Yes, you're absolutely right. There's where they go through "T-cell" bootcamp, so the body doesn't end up with Autoimmunological diseases or worse. The ones that fail the test is phagocytosed.
But the fact remains that active agents of T-cells derives matured from the Thymus CD-8, CD-4 helper cells... etc.

Answer 5

So does this mean that all lymphocytes are 'produced' from the Bone Marrow?

Answer 6

Yes, but the T-cells that leaves the bonemarrow are not really T-cells yet, they serve no fuction. It's in the Thymus where they mature so in a matter of speaking T-cells derives from the Thymus. But yes originally Both comes from the Bone marrow
B-cells mature in the bone marrow therefore it's safe to say that they originates from the bonemarrow. It's a matter of interpertation of this question. I don't know what your lecture would consider the correct answer. If theres room to write, you can mention that T-cells mature in Thymus but originates from the Bone-marrow.

Answer 7

Any more thoughts concerning this questions i could assist with?

Answer 8

You sir, deserve a medal!

Answer 9

Glad i could be of help.