Sublimation is the change of state from solid to gas. Some of the solid matters change their states directly to the gas with the gained heat. For example, dry ice (frozen CO2) sublimate when heat is given. Inverse of this process is called deposition, in which gas matters lost heat and change their phase to solid.
Medical Definition of Hematopoiesis Hematopoiesis: The production of all types of blood cells including formation, development, and differentiation of blood cells. Prenatally, hematopoiesis occurs in the yolk sack, then in the liver, and lastly in the bone marrow. In the normal situation, hematopoiesis in adults occurs in the bone marrow and lymphatic tissues. All types of blood cells are derived from primitive cells that are pluripotent (they have the potential to develop into all types of blood cells).
Blood cells are constantly formed through a process called hematopoiesis (also called hemopoiesis). The hematopoietic stem cells âthose that give rise to blood cellsâoriginate in the yolk sac of the human embryo and then migrate to the liver.Hematopoiesis thus occurs in the liver of the fetus.ymphoid tissue includes the lymph nodes, tonsils, spleen, and thymus. The bone marrow produces all of the different types of blood cells; the lymphoid tissue produces lymphocytes derived from cells that originated in the bone marrow. Hematopoiesis begins the same way in both myeloid and lymphoid tissue.