Haematology Flashcards
what are the three components of blood?
red blood cells
plasma
clotting agents
what are the three principal functions of blood?
transport
fighting infection
promoting vascular integrity
what are the three general pathogenic mechanisms of haematological abnormalities?
- too many cells
- not enough cells
- abnormal function of cells
what aremain components of bone marrow?
haemopoietic stem cells
adipose tissue
which types of blood cells are classed as myeloid cells?
erythrocytes platelets neutrophils basophils eosinophils monocytes
which types of blood cells are classed as lymphoid cells?
B cells
T cells
NK cells
what are the three subtypes of T cells, and what is their function?
- cytotoxic T cells - kill pathogen
- helper T cells - help cytotoxic T cells kill pathogens and help antibody production
- regulatory T cells - dampen down immune response
what can reticulocytes be useful for?
useful for measuring bone marrow function (ie red cell production)
what is erythropoietin, where is it produced and why?
hormone that is produced by the kidneys in response to hypoxia, stimulates red blood cell production by bone marrow
what is the function of erythropoietin?
it stimulates haematopoietic stem cells in bone marrow to differentiate into erythrocytes
what are the stages of red blood cell differentiation?
haematopoietic stem cell –> myeloid progenitor cell -> erythroblast -> reticulocyte -> erythrocyte
how long does it take for reticulocytes to differentiate into erythrocytes?
~24 hours
what is the lifespan of an erythrocyte?
~120 days
what hormone regulates platelet production?
thrombopoietin
what is the lifespan of a platelet?
7 days
where is thrombopoietin produced?
in the liver
what is the lifespan of a neutrophil?
1-2 days
what stimulates neutrophil production?
granulocyte-colony stimulating factors
interleukins
macrophages
what are the stages of platelet differentiation?
haematopoietic stem cell -> myeloid progenitor cell -> megakaryocyte -> platelet
what are the stages of neutrophil differentiation?
haematopoietic stem cell -> myeloid progenitor cell -> neutrophil
what are monocytes?
macrophages that stay in the blood
what name is given to monocytes that have migrated to 1. liver, 2. kidneys, 3. skin, 4. brain?
- kuppfer cells
- mesangial cells
- langerhans cells
- microglia
what is main function of eosinophils?
fighting off parasite infections and mediating allergies
where do B and T cells mature?
B cells - bone marrow
T cells - thymus