Question

Which of the following is responsible for the production of blood cells?
A. Bone marrow
B. Mesentery
C. Calcium
D. Tendons

Answer 1

Hmmm, well bone marrow is fatty stuff in the middle of bones (which is often red in colour and contains diving cells), the Mesentery is "A fold of the peritoneum that attaches the stomach and other organs to the posterior wall of the abdomen", Calcium is a white element and tendons help you move around "A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone."

So given that new knowledge, which one do you think it is? :D

Answer 2

red blood cell produce in the bone marrow but Tendons are major site of blood cell production

Answer 3

Red blood cells are indeed producted in bone marrow, but I think you might have gotten confused with the tendons there?

http://www.merckmanuals.com/home/blood_disorders/biology_of_blood/formation_of_blood_cells.html

Answer 4

Bone marrow