In the Bone Marrow, New Blood Cells Must Enter the Circulation

Question

In the bone marrow, new blood cells must enter the circulation through
A) arterioles.
B) continuous capillaries.
C) fenestrated capillaries.
D) sinusoidal capillaries.
E) venules.

Accepted Answer

Sinusoidal capillaries allow for the passage of immature blood cells, including the newly formed blood cells in the bone marrow. The other choices either do not allow for the passage of blood cells or do not describe the type of capillary found in the bone marrow.