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:
Hand Burns 325 Estimating the depth of the burn is important to approximate time to healing. First- and superficial second-degree burns should heal within 2 weeks, whereas deep second- and third-degree burns can take 3â4 weeks or longer to heal. If the burns do not show significant evidence of healing after 7â10 days