This is called a clot . The remaining liquid is known as serum . Because the fibrinogen was converted into fibrin to form to clot, serum contains no fibrinogen. A clot will not form. When the blood sample separates into the two components, the liquid portion is known as plasma.
Plasma contains fibrinogen.
Red blood cells and plasma carry oxygen and nourishment to all parts of the body and, at the same time, pick up waste products from the tissues to be processed by the kidneys and lungs. In general, the red blood cell is simply a solution of hemoglobin that is contained within a membrane. Its life span is between 100 and 120 days. In the adult, red cells are produces in the bone marrow of the axial skeleton, and proximal ends of the long bone. White blood cells are produced by the lymph nodes, spleen, thymus, and bone marrow.