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Questions and Answers
What is the term for the cell type that is committed to becoming a specific type of blood cell?
What is the term for the cell type that is committed to becoming a specific type of blood cell?
What does the abbreviation CFU-E stand for?
What does the abbreviation CFU-E stand for?
Which of the following is NOT a characteristic of committed stem cells?
Which of the following is NOT a characteristic of committed stem cells?
What is the difference between intermediate-stage cells and multipotential stem cells?
What is the difference between intermediate-stage cells and multipotential stem cells?
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Which of the following abbreviations represents a colony-forming unit that produces granulocytes and monocytes?
Which of the following abbreviations represents a colony-forming unit that produces granulocytes and monocytes?
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What is the name given to the process by which committed stem cells produce colonies of specific cell types in culture?
What is the name given to the process by which committed stem cells produce colonies of specific cell types in culture?
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What is the primary site of red blood cell production during the last month of gestation and after birth?
What is the primary site of red blood cell production during the last month of gestation and after birth?
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Which of the following statements about committed stem cells is TRUE?
Which of the following statements about committed stem cells is TRUE?
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Which of the following bones contribute to red blood cell production throughout a person's life?
Which of the following bones contribute to red blood cell production throughout a person's life?
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What happens to the bone marrow of long bones (excluding the proximal humeri and tibiae) as an individual ages?
What happens to the bone marrow of long bones (excluding the proximal humeri and tibiae) as an individual ages?
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A committed stem cell that produces lymphocytes would be designated as which of the following?
A committed stem cell that produces lymphocytes would be designated as which of the following?
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What is the primary role of the multipotential hematopoietic stem cells in the bone marrow?
What is the primary role of the multipotential hematopoietic stem cells in the bone marrow?
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What is the significance of the multipotential hematopoietic stem cells remaining in the bone marrow as new cells are produced?
What is the significance of the multipotential hematopoietic stem cells remaining in the bone marrow as new cells are produced?
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As an individual ages, what happens to the number of multipotential hematopoietic stem cells in the bone marrow?
As an individual ages, what happens to the number of multipotential hematopoietic stem cells in the bone marrow?
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Which of the following statements accurately reflects the shape of a red blood cell?
Which of the following statements accurately reflects the shape of a red blood cell?
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Compared to the liver, the spleen and lymph nodes play what role in red blood cell production?
Compared to the liver, the spleen and lymph nodes play what role in red blood cell production?
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Which of the following is a direct precursor to the formation of erythrocytes?
Which of the following is a direct precursor to the formation of erythrocytes?
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Which of the following cell types is NOT a direct descendant of CFU-GM?
Which of the following cell types is NOT a direct descendant of CFU-GM?
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Based on the diagram, which of the following is a direct descendant of CFU-S?
Based on the diagram, which of the following is a direct descendant of CFU-S?
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Which of the following cell types is involved in the formation of both red blood cells and white blood cells?
Which of the following cell types is involved in the formation of both red blood cells and white blood cells?
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According to the diagram, which of these is not directly derived from the MHSC?
According to the diagram, which of these is not directly derived from the MHSC?
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Which cell type is directly responsible for the production of platelets?
Which cell type is directly responsible for the production of platelets?
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What is the correct order of cell development from MHSC to erythrocyte?
What is the correct order of cell development from MHSC to erythrocyte?
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What is the name of the cells responsible for controlling the growth and reproduction of the stem cells?
What is the name of the cells responsible for controlling the growth and reproduction of the stem cells?
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What happens to blood volume in polycythemia?
What happens to blood volume in polycythemia?
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How does polycythemia affect cardiac output during exercise?
How does polycythemia affect cardiac output during exercise?
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What mechanism helps to regulate arterial pressure in polycythemia?
What mechanism helps to regulate arterial pressure in polycythemia?
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What is the consequence of tissue hypoxia in individuals with polycythemia during exercise?
What is the consequence of tissue hypoxia in individuals with polycythemia during exercise?
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In individuals with elevated arterial pressure due to polycythemia, what is true for most people?
In individuals with elevated arterial pressure due to polycythemia, what is true for most people?
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What causes secondary polycythemia?
What causes secondary polycythemia?
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How does polycythemia vera affect the skin’s color?
How does polycythemia vera affect the skin’s color?
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What occurs beyond certain limits of regulation in polycythemia?
What occurs beyond certain limits of regulation in polycythemia?
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What happens to RBC concentration after rapid hemorrhage if a second hemorrhage does not occur?
What happens to RBC concentration after rapid hemorrhage if a second hemorrhage does not occur?
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What type of hemoglobin is produced in sickle cell anemia?
What type of hemoglobin is produced in sickle cell anemia?
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In hereditary spherocytosis, how do the RBCs differ from normal RBCs?
In hereditary spherocytosis, how do the RBCs differ from normal RBCs?
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What physiological effect occurs in patients with chronic blood loss anemia?
What physiological effect occurs in patients with chronic blood loss anemia?
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What is a characteristic feature of microcytic hypochromic anemia?
What is a characteristic feature of microcytic hypochromic anemia?
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What can lead to bone marrow aplasia?
What can lead to bone marrow aplasia?
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What causes the RBCs in sickle cell anemia to take on a sickle shape?
What causes the RBCs in sickle cell anemia to take on a sickle shape?
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What happens to RBCs in hereditary spherocytosis when they pass through the splenic pulp?
What happens to RBCs in hereditary spherocytosis when they pass through the splenic pulp?
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What is the role of macrophages in the destruction of hemoglobin?
What is the role of macrophages in the destruction of hemoglobin?
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Which of the following is NOT a source of iron absorbed by the small intestine, as described in the text?
Which of the following is NOT a source of iron absorbed by the small intestine, as described in the text?
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What is the primary function of transferrin in iron absorption?
What is the primary function of transferrin in iron absorption?
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How is bilirubin formed during the breakdown of hemoglobin?
How is bilirubin formed during the breakdown of hemoglobin?
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What is the relationship between transferrin and ferritin?
What is the relationship between transferrin and ferritin?
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Which of the following is NOT a characteristic of anemia?
Which of the following is NOT a characteristic of anemia?
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What is the primary role of apotransferrin in iron absorption?
What is the primary role of apotransferrin in iron absorption?
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How does the breakdown of hemoglobin contribute to the production of new red blood cells?
How does the breakdown of hemoglobin contribute to the production of new red blood cells?
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Flashcards
Apotransferrin
Apotransferrin
A protein secreted by the liver that binds iron in the bile.
Transferrin
Transferrin
A combination of apotransferrin and iron, responsible for iron transport in the blood.
Kupffer cells
Kupffer cells
Macrophages in the liver that help destroy hemoglobin.
Hemoglobin destruction
Hemoglobin destruction
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Iron absorption
Iron absorption
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Bilirubin
Bilirubin
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Ferritin
Ferritin
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Anemia
Anemia
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Intermediate-stage cells
Intermediate-stage cells
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Committed stem cells
Committed stem cells
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Colony-forming units (CFUs)
Colony-forming units (CFUs)
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CFU-E
CFU-E
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CFU-GM
CFU-GM
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Erythrocytes
Erythrocytes
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Granulocytes
Granulocytes
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Monocytes
Monocytes
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Red Blood Cell Production
Red Blood Cell Production
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Growth Inducers
Growth Inducers
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MHSC
MHSC
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Megakaryocytes
Megakaryocytes
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Blood Loss Anemia
Blood Loss Anemia
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Spherocytosis
Spherocytosis
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Microcytic Hypochromic Anemia
Microcytic Hypochromic Anemia
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Sickle Cell Anemia
Sickle Cell Anemia
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Hemoglobin S
Hemoglobin S
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Bone Marrow Aplasia
Bone Marrow Aplasia
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Effects of High-Dose Radiation
Effects of High-Dose Radiation
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Chronic Blood Loss
Chronic Blood Loss
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Polycythemia
Polycythemia
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Effects of Polycythemia
Effects of Polycythemia
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Cardiac Output in Polycythemia
Cardiac Output in Polycythemia
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Tissue Hypoxia
Tissue Hypoxia
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Arterial Pressure in Polycythemia
Arterial Pressure in Polycythemia
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Secondary Polycythemia
Secondary Polycythemia
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Subpapillary Venous Plexus
Subpapillary Venous Plexus
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RBC Production
RBC Production
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Multipotential Hematopoietic Stem Cells
Multipotential Hematopoietic Stem Cells
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Bone Marrow Age Limit
Bone Marrow Age Limit
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Long Bones
Long Bones
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Fatty Marrow
Fatty Marrow
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Membranous Bones
Membranous Bones
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RBC Lifecycle
RBC Lifecycle
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Age and RBC Production
Age and RBC Production
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Study Notes
Red Blood Cells, Anemia, and Polycythemia
- Red blood cells (RBCs), also known as erythrocytes, transport oxygen from lungs to tissues using hemoglobin.
- Hemoglobin is enclosed within RBCs in humans, unlike some animals.
- RBCs contain carbonic anhydrase, an enzyme speeding up CO2 and water reaction to carbonic acid, facilitating CO2 transport.
- RBCs act as buffers for maintaining blood's acid-base balance.
- Normal RBCs are biconcave discs, about 7.8 micrometers in diameter and 2.5 micrometers thick.
- The average RBC volume is 90-95 cubic micrometers.
- RBCs can change shape to fit through capillaries.
- Healthy men have ~5.2 million RBCs/cubic millimeter, women ~4.7 million.
- Persons at high altitudes have higher RBC counts.
- RBCs can concentrate hemoglobin up to 34 g/100 ml of cells.
- Healthy men have ~15 g hemoglobin/100 ml of blood, women ~14 g.
- 1 g of hemoglobin can carry ~1.34 ml oxygen.
- During gestation, primitive RBCs are first created in the yolk sac, then the liver, then the bone marrow exclusively.
- Bone marrow produces RBCs until about 5 years old.
- The production rate of RBCs decreases in older adults.
Genesis of Blood Cells
- Multipotential hematopoietic stem cells (MHSC) in bone marrow are the progenitor cells for all blood cells.
- MHSC differentiate into committed stem cells (CFU).
- Erythropoietin (a glycoprotein) is mainly produced by the kidneys, with some from the liver, and regulated by tissue oxygenation.
- Hypoxia (low oxygen) increases erythropoietin production.
- Erythropoietin stimulates the production of proerythroblasts.
- Proerythroblasts mature into erythrocytes through various stages(e.g. basophil, polychromatophils, reticulocytes)
- Normal RBC lifespan is approximately 120 days
- Reticulocytes are immature RBCs, make up ~1% of total RBCs, disappear after 1-2 day.
- Aged/defective RBCs are destroyed by macrophages (e.g., Kupffer cells in the liver).
Anemia
- Anemia is a condition characterized by low hemoglobin levels or a reduced number of RBCs.
- Blood loss anemia is caused by rapid or chronic blood loss.
- Hemolytic anemia results from premature destruction of red blood cells.
- Aplastic anemia occurs with reduced bone marrow function.
- Megaloblastic anemia is linked to insufficient B12 or folate, inhibiting proper DNA synthesis, creating large, immature RBCs.
Polycythemia
- Secondary polycythemia develops as a result of tissue hypoxia.
- Polycythemia vera is a disease where the bone marrow overproduces RBCs, platelets, and granulocytes.
- Blood viscosity increases in polycythemia, impacting blood flow.
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Description
Test your knowledge on red blood cells, their functions, and related conditions such as anemia and polycythemia. This quiz covers topics like hemoglobin, RBC structure, and their role in oxygen transport and acid-base balance in the body. Perfect for students studying human biology or health sciences.