Erythropoiesis = formation of erythrocytes. 1  the body must produce about 2.5 million new RBCs every second. 2  in adults, erythropoiesis occurs mainly in the marrow of the sternum, ribs, vertebral processes, and skull bones. 3  begins with a cell called a hemocytoblast or stem cell (below)  rate is regulated by oxygen levels:
1 Second Intention Healing â A wound that is extensive and involves considerable tissue loss, and in which the edges cannot be brought together heals in this manner. 2  This is how pressure ulcers heal. 3  Secondary intention healing differs from primary intention healing in three ways:
Wounds that heal by secondary intention close by scar formation. Check the skin for signs of scarring, which indicates an earlier full-thickness (or greater) wound. Scar that is immature may be thin and flexible and be at risk for skin breakdown. Scar never has the same breaking strength as original skin (Figure 5).