When hematopoiesis occurs in the liver in an adult, it is called: ...

[renzo156]

When hematopoiesis occurs in the liver in an adult, it is called:
 
  a. Intramedullary
  b. Intermedullary
  c. Normal
  d. Extramedullary

Question 2

How do cells get from the bone marrow into peripheral circulation?
 
  a. Stem cells escape the bone marrow and mature in peripheral circulation.
  b. Mature cells attach to a carrier protein for transport.
  c. Capillaries flow into the marrow and pluck out precursor cells.
  d. Mature cells squeeze through spaces in the vessel endothelial lining.

[Benayers]

Answer to Question 1

ANS: D
Whenever hematopoiesis occurs outside the bone marrow in an adult, other than lymphopoiesis in lymphatic tissue, it is called extramedullary. This is abnormal.

Answer to Question 2

ANS: D
As mature blood cells come into contact with endothelial cells in the bone marrow, they bind to the surface via a receptor-mediated process. The binding creates a space between the luminal adventitial and endothelial cells. This allows the bone marrow cells to escape into circulation.