What are the names of the structures labeled A? 
Definitions:
Megakaryocyte
A large bone marrow cell responsible for the production of blood thrombocytes (platelets), which are necessary for blood clotting.
Monocyte
A monocyte is a type of white blood cell part of the human body's immune system that fights off viruses, bacteria, and fungi; these cells can differentiate into macrophages and dendritic cells.
Hematocrit Value
The proportion of blood volume that is occupied by red blood cells, expressed as a percentage.
Polycythemia
A blood disorder characterized by an increased number of red blood cells, leading to increased blood viscosity.
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