1.1-Hematopoiesis

Hemoglobin

A protein in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.

Hematopoiesis

The continuous process of blood cell production, which includes cell renewal, proliferation, differentiation, and maturation.

Erythropoiesis

The process of red blood cell (RBC) production.

Erythropoietin (EPO)

A glycoprotein hormone produced by the kidneys that stimulates the production of red blood cells in the bone marrow.

Reticulocyte

An immature red blood cell that has recently been released from the bone marrow into the bloodstream.

Myeloid Period

The phase of hematopoiesis that occurs inside the bone marrow, starting at the 4th to 5th month of pregnancy and continuing throughout life.

Apoptosis

The process of programmed cell death that occurs in multicellular organisms.

Polycythemia Vera

A neoplastic clonal myeloproliferative disorder characterized by the uncontrolled production of blood cells.

Stem Cell Theory: Monophyletic Theory

All blood cells are derived from a single progenitor stem cell.

Stem Cell Theory: Dualistic Theory

Blood cells come from two types of stem cells: myeloid and lymphoid stem cells.

Circadian regulation of erythropoiesis

The influence of circadian rhythms on the production of red blood cells.

Hgb A1

The most common type of hemoglobin found in normal adult blood, composed of two alpha and two beta chains.

Buffy coat

The layer of white blood cells and platelets that forms after blood is centrifuged.

Thrombopoietin (TPO)

A hormone produced mainly by the liver that regulates the production of platelets.

Monopoiesis

The process of producing monocytes, a type of white blood cell.

Megakaryopoiesis

The process of producing megakaryocytes, the precursor cells that produce platelets.

Granulocytopoiesis

The process of developing granulocytes, a type of white blood cell.

Hematopoietic Stem Cells (HSC)

Cells capable of self-renewal and differentiation into all types of blood cells.

Immunity

The ability of an organism to resist disease by the action of specific antibodies or sensitized white blood cells.

Fibrinogen

A protein produced by the liver that is essential for blood clotting.

Thalassemia

A genetic blood disorder characterized by reduced hemoglobin production.

Erythrocyte characteristics

Red blood cells are biconcave, lack a nucleus, and contain hemoglobin.

Spleen function

The organ responsible for filtering blood, recycling iron, and managing blood cells.

Bilirubin

A yellow compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates.

Hemorrhage

Excessive or uncontrolled bleeding.

Hypoxia

A deficiency in the amount of oxygen reaching the tissues.

Leukopoiesis

The process of producing white blood cells.

Neutrophils

White blood cells that are the first responders to infections.

Lymphocytes

A type of white blood cell involved in the immune response.

Hematology

The study of blood, blood-forming tissues, and the diseases associated with them.

Progenitor cells

Immature cells that have the potential to differentiate into various types of cells.

Granulocytes

A type of white blood cell with granules in its cytoplasm, including neutrophils, eosinophils, and basophils.

Platelets

Cell fragments that play a key role in blood clotting.

Alkaline pH of blood

Normal blood pH is slightly alkaline, ranging from 7.35 to 7.45.

Vasodilation

The widening of blood vessels, which decreases blood pressure.

Anemia

A condition characterized by a deficiency of red blood cells or hemoglobin in the blood.

Stages of Erythropoiesis

The process of red blood cell production involves several stages: proerythroblast, basophilic erythroblast, polychromatic erythroblast, orthochromatic erythroblast, reticulocyte, and finally erythrocyte.

Proerythroblast

The earliest precursor in the red blood cell lineage, characterized by a large nucleus and basophilic cytoplasm.

Basophilic Erythroblast

A stage in erythropoiesis where the cell begins to accumulate hemoglobin, leading to a smaller nucleus and more dense cytoplasm.

Polychromatic Erythroblast

The stage in which the erythroblast accumulates more hemoglobin, resulting in a mix of blue and pink coloration in the cytoplasm.

Orthochromatic Erythroblast

A late stage of erythroblast characterized by a condensed nucleus and high hemoglobin content, becoming more red in appearance.

Reticulocyte

An immature red blood cell that has expelled its nucleus and enters the bloodstream before maturing into a fully developed erythrocyte.

Erythrocyte

The final stage of red blood cell development, fully mature and equipped to transport oxygen and carbon dioxide throughout the body.

Proerythroblast Color and Size

Large nucleus, basophilic cytoplasm (blue), typically about 12-20 micrometers.

Basophilic Erythroblast Color and Size

Smaller nucleus, dense basophilic cytoplasm, around 10-15 micrometers, begins to show pink due to hemoglobin accumulation.

Polychromatic Erythroblast Color and Size

Cytoplasm shows a mix of blue and pink, about 10-15 micrometers in size, indicating significant hemoglobin accumulation.

Orthochromatic Erythroblast Color and Size

More red in appearance, smaller size (8-10 micrometers), with a condensed nucleus and high hemoglobin content.

Reticulocyte Color and Size

Cytoplasm is a pale pink with residual RNA, around 7-8 micrometers, and lacks a nucleus.

Erythrocyte Color and Size

Fully mature, biconcave disc, typically about 6-8 micrometers, and contains a deep red color due to hemoglobin.