Blood cells (formed components)

Plasma (intercellular substance)

Biconcave disc shape - increases the surface area of ​​red blood cells and facilitates gas exchange Mature red blood cells have no nuclei, no organelles, and the cytoplasm is filled with hemoglobin - which combines and transports oxygen and carbon dioxide Morphological variability

Hemolysis: Blood Shadow Bleeding: RBCs flowing out of blood vessels Anemia: RBC<3×10*12/L: Hb<100g/L

ABO blood type - based on whether there are specific receptors on the surface of the red blood cell membrane

Average lifespan 120 days

Reticulocytes: immature red blood cells with the ability to synthesize hemoglobin

nucleated, spherical Exit blood vessel execution function

Depending on whether there are special particles

Biconvex flat disk, no core

Granule area (center): blue-purple granules

Transparent area (peripheral part): light blue

Life span 7 to 14 days

Normal value: 100～300×10*9/L

red bone marrow

yellow bone marrow

Originates from the blood islands in the yolk sac of the human embryo, and mainly in the red bone marrow after birth

1) The cell body changes from large to small, but the megakaryocyte changes from small to large.

2) The nucleus changes from large to small, but the megakaryocyte changes from small to large. Euchromatin changes from more to less, nuclei change from shallow to dark, and nucleoli change from obvious to missing.

3) The cytoplasm changes from less to more, and the basophilia gradually becomes weaker (lymphocytes and monocytes are still basophilic). The number of special structures has increased

4) Cell division ability changes from existence to non-existence (lymphocytes still have the potential to divide)