Bone Marrow and Hematopoiesis Quiz

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Questions and Answers

What proportion of bone marrow is typically hematopoietically active in a normal adult?

  • 25%
  • 75%
  • 100%
  • 50% (correct)

Which type of marrow increases activity when faced with conditions that require heightened hematopoiesis?

  • Spongy marrow
  • Red marrow (correct)
  • Yellow marrow
  • White marrow

What is the defining characteristic of hypercellular or hyperplastic bone marrow?

  • Less than 30% hematopoietic cells
  • More than 70% hematopoietic cells (correct)
  • 30-70% hematopoietic cells
  • Consistently 50% hematopoietic cells

What type of cells originate from mesenchymal cells in the bone marrow?

<p>Stromal cells (D)</p> Signup and view all the answers

Which of the following describes the role of osteoblasts in bone marrow?

<p>They are involved in bone remodeling (D)</p> Signup and view all the answers

What is the purpose of the autoimmune hemolysis tests mentioned in the content?

<p>To measure the amount of hemolysis (A)</p> Signup and view all the answers

Which condition is associated with a marked decrease in reticulocytes?

<p>Aplastic crisis (D)</p> Signup and view all the answers

What does the acidified glycerol test measure?

<p>Amount of hemolysis (B)</p> Signup and view all the answers

What is a significant complication associated with viral syndromes in HS patients?

<p>Hemolytic crisis (A)</p> Signup and view all the answers

What technique is used to assess variations in membrane surface area and cell water content?

<p>Osmotic gradient ektacytometry (D)</p> Signup and view all the answers

What is the main inheritance pattern of hereditary elliptocytosis (HE)?

<p>Autosomal dominant (B)</p> Signup and view all the answers

Which gene is associated with coding for α-spectrin in hereditary elliptocytosis?

<p>SPTA1 (C)</p> Signup and view all the answers

What structural component is disrupted in the RBC membrane due to mutations in HE?

<p>Horizontal linkages in the protein cytoskeleton (D)</p> Signup and view all the answers

What defines cases classified under hereditary pyropoikilocytosis (HPP)?

<p>Marked RBC fragmentation on heating (A)</p> Signup and view all the answers

Which of the following is NOT a gene mutation associated with hereditary elliptocytosis?

<p>GPC (D)</p> Signup and view all the answers

What percentage of HE patients typically exhibit moderate to severe anemia?

<p>10% (A)</p> Signup and view all the answers

What is a common laboratory finding in individuals with hereditary elliptocytosis?

<p>Majority of patients are asymptomatic (B)</p> Signup and view all the answers

What is the result of the mutations affecting GPC in hereditary elliptocytosis?

<p>Absence of Gerbich antigens (B)</p> Signup and view all the answers

What is the main application of holotranscobalamin in clinical settings?

<p>Detecting vitamin B12 deficiency (D)</p> Signup and view all the answers

What type of anemia is characterized by unimpaired DNA synthesis?

<p>Macrocytic nonmegaloblastic anemia (B)</p> Signup and view all the answers

Which diagnostic test is utilized to analyze the presence of parasitic infections related to vitamin B12 deficiency?

<p>Stool analysis for eggs or proglottids (A)</p> Signup and view all the answers

What is the consequence of achlorhydria with respect to serum gastrin levels?

<p>Increased serum gastrin levels (B)</p> Signup and view all the answers

Which method is NOT typically used to detect anti-intrinsic factor antibodies?

<p>GC-MS (B)</p> Signup and view all the answers

What is a common trait of patients with nonmegaloblastic, macrocytic anemia?

<p>Lack of oval macrocytes in peripheral blood (C)</p> Signup and view all the answers

Which vitamin deficiency requires reflexive testing for MMA and homocysteine levels?

<p>Vitamin B12 deficiency (C)</p> Signup and view all the answers

What is a common physiological condition associated with macrocytosis?

<p>Newborn status (C)</p> Signup and view all the answers

What specific test is most indicative of pernicious anemia?

<p>Antibody assays for anti-IF antibodies (A)</p> Signup and view all the answers

What is the primary function of platelets in hemostasis?

<p>They form a platelet plug at the site of bleeding. (A)</p> Signup and view all the answers

What type of blood specimen is typically used for a Complete Blood Count (CBC)?

<p>Capillary blood and venous blood (D)</p> Signup and view all the answers

Which characteristic indicates that a blood film must be stained before examination?

<p>To enhance the visibility of cell morphology (D)</p> Signup and view all the answers

What is an indicator of macrocytic cells in a blood film?

<p>Larger cells than normal size (D)</p> Signup and view all the answers

What type of blood color would indicate hypochromic red blood cells?

<p>Decreased concentration of hemoglobin (C)</p> Signup and view all the answers

What is the primary role of the phlebotomist in the laboratory setting?

<p>To collect blood samples from patients for examination (B)</p> Signup and view all the answers

What is indicated by the formulation of fibrin after an injury?

<p>The activation of coagulation factors (C)</p> Signup and view all the answers

How should a good blood smear be prepared?

<p>With the correct amount of blood for optimal presentation (A)</p> Signup and view all the answers

What is the shape and size of normal platelets?

<p>Very small, round, and anucleated (D)</p> Signup and view all the answers

What must a blood smear be examined under for proper morphology identification?

<p>Under oil immersion objective (B)</p> Signup and view all the answers

What laboratory tests may be needed to rule out conditions associated with elliptocytes?

<p>Iron studies and tests for vitamin B12 deficiency (D)</p> Signup and view all the answers

In cases of acquired defects related to elliptocytosis, which gene is mentioned as being affected?

<p>Gene for protein 4.1 (C)</p> Signup and view all the answers

What is the most likely condition associated with hemolytic anemia leading to cholelithiasis due to bilirubin gallstones?

<p>Hereditary elliptocytosis (C)</p> Signup and view all the answers

What type of crises can patients with hereditary elliptocytosis experience?

<p>Hemolytic, aplastic, and megaloblastic crises (A)</p> Signup and view all the answers

What is the expected MCV range in patients with the HPP phenotype?

<p>50 to 65 fL (A)</p> Signup and view all the answers

What is a primary treatment for HE patients who are significantly anemic and show signs of hemolysis?

<p>Splenectomy (A)</p> Signup and view all the answers

What physical examination finding is most associated with the HPP phenotype?

<p>Extreme poikilocytosis (B)</p> Signup and view all the answers

How do elliptocytes correlate with disease severity in patients with elliptocytosis?

<p>Does not correlate (C)</p> Signup and view all the answers

Flashcards

Bone Marrow

A spongy tissue found inside bones where blood cells are made.

Hematopoiesis

The process of forming blood cells in the bone marrow.

Hematopoietic Stem Cells (HSCs)

Cells in the bone marrow that give rise to all types of blood cells.

Yellow Marrow

A type of bone marrow that is filled with fat and is less active in blood cell production.

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Red Marrow

A type of bone marrow that is actively producing blood cells and has a higher proportion of hematopoietic cells.

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Platelets

Small, round, anucleated cells that help control bleeding by forming platelet plugs and activating clotting factors.

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Primary Hemostasis

The process where platelets form a temporary plug at the site of injury.

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Secondary Hemostasis

The process involving clotting factors that forms a stable fibrin clot, permanently sealing the injured blood vessel.

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Complete Blood Count (CBC)

A complete blood count (CBC) is a blood test that measures different components of blood, including red blood cells (RBCs), white blood cells (WBCs), and platelets.

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Blood Specimen Collection

The process of collecting a blood sample from a patient for analysis.

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Fibrin-Free Blood Specimen

A blood specimen should not contain fibrin, as its presence indicates the activation of coagulation factors, which can affect the accuracy of the results.

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Specimen Accession

The process of assigning a unique identification number to each blood specimen received in the laboratory, ensuring proper and efficient tracking.

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Blood Film Examination

A blood smear is a thin layer of blood spread on a microscope slide for examination.

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Staining Procedures

The process of staining a blood smear to make the different cell types visible under a microscope.

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Red Blood Cell (RBC) Morphology

RBCs (Red Blood Cells) are classified by size. Normocytic RBCs are normal size, macrocytic RBCs are larger, and microcytic RBCs are smaller.

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Macrocytic Nonmegaloblastic Anemia

A type of anemia where red blood cells are larger than normal, but DNA synthesis is not impaired. Causes include liver disease, chronic alcoholism, or bone marrow failure.

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Reticulocytosis

A type of anemia where red blood cells are larger than normal due to increased production of reticulocytes (immature red blood cells).

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Holotranscobalamin

The active form of vitamin B12 that is used by the body. Used to test for metabolic vitamin B12 deficiency.

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Diphyllobothrium latum

A parasitic worm that can cause vitamin B12 deficiency. It's a fish tapeworm, and its eggs or proglottids (segments) can be found in stool.

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Bone Marrow Aspiration

A confirmatory test for vitamin B12 deficiency where a sample of bone marrow is examined under a microscope.

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MMA (Methylmalonic Acid) Test

A test used to measure the levels of methylmalonic acid (MMA) in the blood. Increased MMA indicates vitamin B12 deficiency.

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Homocysteine Test

A test used to measure the levels of homocysteine in the blood. Increased homocysteine indicates vitamin B12 deficiency.

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Anti-IF Antibody Test

A test used to detect antibodies that specifically attack intrinsic factor. These antibodies are commonly found in pernicious anemia, which is a type of vitamin B12 deficiency.

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Anti-Parietal Cell Antibody Test

A test used to detect antibodies against parietal cells. These antibodies are also associated with pernicious anemia.

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Serum Gastrin Test

A test used to measure the levels of gastrin in the blood. Increased gastrin levels can indicate achlorhydria (lack of stomach acid), which is often seen in pernicious anemia.

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Fluorescent Dye Binding

The intensity of fluorescence decreases in the absence of transmembrane proteins due to reduced binding of the fluorescent dye. This technique helps identify membrane protein deficiencies.

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SDS-PAGE

SDS-PAGE is an electrophoresis method used to separate proteins based on their size. It helps identify membrane protein deficiencies by showing protein bands on a gel.

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Radioimmunoassay (RIA)

Radioimmunoassay (RIA) is a technique that uses radioactive isotopes to quantify specific proteins. It helps measure the amount of membrane protein in a sample.

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Acidified Glycerol Test

This test measures the amount of hemolysis (red blood cell breakdown) in a sample. It helps assess the integrity of red blood cell membranes.

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Autohemolysis Test

This test measures the amount of hemolysis in red blood cells after incubation with and without glucose. It helps identify deficiencies in red blood cell metabolism.

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Hereditary Elliptocytosis (HE)

In this condition, red blood cells take on an elliptical shape. It's usually inherited and can be mild or severe.

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Hereditary Pyropoikilocytosis (HPP)

A severe form of HE where red blood cells are very fragile and break down easily, leading to anemia.

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Elliptocytes

The presence of abnormally shaped red blood cells, often seen in HE.

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Cholelithiasis in HE

HE can cause gallstones due to increased bilirubin levels from red blood cell breakdown.

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Anemia in HE

A decrease in the number of red blood cells, often due to their breakdown in HE.

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Aplastic Crisis in HE

A condition where the bone marrow fails to produce enough blood cells, sometimes seen in HE.

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Megaloblastic Crisis in HE

A condition where the body produces abnormally large red blood cells, which can occur in HE complications.

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Splenectomy for HE

A common treatment for HE patients with severe anemia and hemolysis. Splens remove damaged red blood cells.

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Hereditary Elliptocytosis

A genetic disorder that affects the red blood cell membrane, causing a weakened structure and resulting in elliptocytes.

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Glycophorin C (GPC)

The protein found in red blood cells responsible for maintaining the structure of the RBC membrane.

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Absence of Glycophorin C (GPC)

The absence of Glycophorin C (GPC) in red blood cells, caused by mutations in the GPC gene, leading to elliptocytosis.

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SPTA1 gene

A gene involved in coding for α-spectrin, a protein crucial for the formation of the red blood cell membrane.

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SPTB gene

A gene responsible for coding for β-spectrin, a protein that, along with α-spectrin, forms part of the red blood cell membrane.

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EPB41 gene

A gene that encodes protein 4.1, a protein that interacts with other red blood cell membrane proteins to maintain its structure.

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