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:
When a wound has closed properly, our work is done. Given the fundamental nature of wound closure, it is worth spending a few moments recapping what we know about the subject. 1  Primary Closure â Wound closure happens in one of three ways. 2  Primary wound closure is the fastest type of closure, and is also known as healing by primary intention.