Primary haemostasis = Platelet plug FIbrin clot( Platelet plug, FIbrin clot )
Secondary Haemostasis = FIbrin clot Platelet plug( FIbrin clot, Platelet plug )

From which progenitor cells do each of the following cell types arise?
B Cells - Lymphoid progenitor Cells Myeloid Progenitor Cells( Lymphoid progenitor Cells, Myeloid Progenitor Cells )
Neutrophil - Myeloid Progenitor Cells Lymphoid Progenitor Cells( Myeloid Progenitor Cells, Lymphoid Progenitor Cells )
Erythrocyte - Myeloid Progenitor Cells Lymphoid Progenitor Cells( Myeloid Progenitor Cells, Lymphoid Progenitor Cells )
Dendritic Cells - Lymphoid Progenitor Cells Myeloid Progenitor Cells( Lymphoid Progenitor Cells, Myeloid Progenitor Cells )

Embryonically, haemopoietic stem cells originate in the mesoderm ectoderm endoderm( mesoderm, ectoderm, endoderm )

In contrast to capillaries venous sinuses( capillaries, venous sinuses ), venous sinuses capillaries( venous sinuses, capillaries ) are larger and have a discontinuous basement membrane

Red Yellow Orange( Red, Yellow, Orange ) bone marrow is haemopoietically active
Yellow Red Orange( Yellow, Red, Orange ) bone marrow is haemopoietically inactive and contains mostly fat

There is an increase in yellow red( yellow, red ) bone marrow with age

Thrombopoietin Lymphopoietin Megakarypoietin( Thrombopoietin, Lymphopoietin, Megakarypoietin ) regulates growth and development of megakaryocytes from their precursors

In terms of investigating haemopoiesis:
For non-lymphoid cells lymphoid cells( non-lymphoid cells, lymphoid cells ), the full blood count and morphological assessment of blood cells is often sufficient for diagnosis
For lymphoid cells non-lymphoid cells( lymphoid cells, non-lymphoid cells ), the expression of antigens indicating the lineage or developmental stage of the cell is required for diagnosis