What is the main site for iron storage in the bone marrow? a. ...

[Charlie]

What is the main site for iron storage in the bone marrow?
 
  a. Stem cells
  b. Transferrin molecules
  c. Endothelial cells
  d. Macrophages

Question 2

What stimulates production of erythropoietin?
 
  a. Decreased red cell number in the bone marrow
  b. Increased peripheral red cell number
  c. Decreased iron stores
  d. Decreased oxygen level in tissue

[Mollythedog]

Answer to Question 1

ANS: D
Macrophages are the primary site for storage of iron in the bone marrow. Stem cells of various kinds are precursors to blood cells. Transferrin is the protein that binds and transports iron to either storage or developing red blood cells (RBCs). Endothelial cells are the lining cells of the bone marrow and blood vessels.

Answer to Question 2

ANS: D
Peritubular cells in the kidney detect too little oxygen in tissue (also called hypoxia). They then synthesize erythropoietin. This increases red cell production in the bone marrow, unless the marrow is unable to respond to respond to the erythropoietin stimulus.