Packed Cell Volume Count (Hematocrit) in Human Physiology
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Questions and Answers

What is the Packed Cell Volume (P.C.V) a measure of?

  • The volume of red blood cells in the blood (correct)
  • The total volume of blood in the body
  • The volume of white blood cells in the blood
  • The volume of plasma in the blood

    • What is the average number of red blood cells per cubic millimeter in healthy men?

  • 4,500,000 (±200,000)
  • 4,700,000 (±300,000)
  • 5,500,000 (±200,000)
  • 5,200,000 (±300,000) (correct)

    • Where are red blood cells derived from?

  • Spleen
  • Bone marrow (correct)
  • Lungs
  • Liver

    • What is the life span of a red blood cell?

    <p>120 days</p> Signup and view all the answers

    What causes the production of greatly increased numbers of erythrocytes?

    <p>Low oxygen exposure for a long time</p> Signup and view all the answers

    What is the procedure for measuring Packed Cell Volume (P.C.V)?

    <p>Puncturing the thumb and allowing the blood to enter a capillary tube</p> Signup and view all the answers

    Which condition is characterized by an increase in the volume of P.C.V above the reference range?

    <p>Dehydration</p> Signup and view all the answers

    What is the term for a decrease in the volume of P.C.V below the normal range?

    <p>Anemia</p> Signup and view all the answers

    What type of anemia results from vitamin B12 and folic acid deficiency?

    <p>Megaloblastic Anemia</p> Signup and view all the answers

    Which type of anemia is characterized by hereditary disorders that make the cells fragile, causing them to rupture easily?

    <p>Hereditary spherocytosis</p> Signup and view all the answers

    What is the condition that results in an increased level of circulating red blood cells in the bloodstream?

    <p>Polycythemia</p> Signup and view all the answers

    What causes primary polycythemias?

    <p>Acquired genetic mutations</p> Signup and view all the answers

    What is the term for a deficiency of hemoglobin in the blood caused by too few red blood cells or too little hemoglobin in the cells?

    <p>Anemia</p> Signup and view all the answers

    Which condition is characterized by an increase in hematocrit, hemoglobin, or RBC?

    <p>Polycythemia Vera</p> Signup and view all the answers

    What is the term for chronic blood loss resulting in RBCs being smaller than normal and having too little hemoglobin inside them?

    <p>Blood Loss Anemia</p> Signup and view all the answers

    What is the average volume of red blood cells per cubic millimeter in healthy women?

    <p>4,700,000 (±300,000)</p> Signup and view all the answers

    What is the term for the process that causes the growth induction and production of greatly increased numbers of erythrocytes?

    <p>Hypoxia</p> Signup and view all the answers

    What is the term for the condition characterized by an increase in hematocrit, hemoglobin, or RBC?

    <p>Polycythemia</p> Signup and view all the answers

    What is the term for the chronic blood loss resulting in RBCs being smaller than normal and having too little hemoglobin inside them?

    <p>Microcytic hypochromic anemia</p> Signup and view all the answers

    Where are red blood cells derived from?

    <p>Pluripotential hematopoietic stem cells in the bone marrow</p> Signup and view all the answers

    What is the condition that results in an increased level of circulating red blood cells in the bloodstream?

    <p>Polycythemia</p> Signup and view all the answers

    What is the normal range of P.C.V for adult male?

    <p>47 ± 7%</p> Signup and view all the answers

    What is the normal range of P.C.V for adult female?

    <p>42 ± 5%</p> Signup and view all the answers

    What is the term for an increase in the volume of P.C.V above the reference range?

    <p>polycythemia</p> Signup and view all the answers

    What is the term for a decrease in the volume of P.C.V below the normal range?

    <p>anemia</p> Signup and view all the answers

    What are the conditions associated with an increase in Hematocrit (PCV) value?

    <p>Dehydration, Burn Injury, Polycythemia Vera, High Altitude, Conditions associated with hypoxia</p> Signup and view all the answers

    Name the conditions associated with a decrease in Hematocrit (PCV) value.

    <p>Pregnancy, Renal failure, Bone marrow failure, Hemolytic anemia, Chemotherapy</p> Signup and view all the answers

    What is the term for a deficiency of hemoglobin in the blood caused by either too few red blood cells or too little hemoglobin in the cells?

    <p>Anemia</p> Signup and view all the answers

    What is the condition that results in an increased level of circulating red blood cells in the bloodstream?

    <p>Polycythemia</p> Signup and view all the answers

    What is the term for lack of functioning bone marrow?

    <p>Aplastic Anemia</p> Signup and view all the answers

    What type of anemia results from vitamin B12 & folic acid deficiency?

    <p>Megaloblastic Anemia</p> Signup and view all the answers

    The Packed Cell Volume (P.C.V) measures the volume of both plasma and blood cells in the blood.

    <p>False</p> Signup and view all the answers

    The average number of RBCs per cubic millimeter is higher in women than in men.

    <p>False</p> Signup and view all the answers

    Erythrocytes have a fixed shape and do not change as they move through capillaries.

    <p>False</p> Signup and view all the answers

    RBCs production is induced by exposure of the blood to high oxygen levels for a short time.

    <p>False</p> Signup and view all the answers

    The life span of a red blood cell is approximately 90 days.

    <p>False</p> Signup and view all the answers

    The volume of the P.C.V does not reflect the volume of the red blood cells.

    <p>False</p> Signup and view all the answers

    An increase in the volume of P.C.V above the reference range is termed as anemia.

    <p>False</p> Signup and view all the answers

    Megaloblastic anemia results from vitamin B12 and folic acid deficiency.

    <p>True</p> Signup and view all the answers

    Hemolytic anemia is characterized by hereditary disorders that make the cells fragile, causing them to rupture easily as they go through the capillaries.

    <p>True</p> Signup and view all the answers

    Bone marrow aplasia means a lack of functioning bone marrow.

    <p>True</p> Signup and view all the answers

    Polycythemia results in a decreased level of circulating red blood cells in the bloodstream.

    <p>False</p> Signup and view all the answers

    Anemia means a deficiency of hemoglobin in the blood caused by too few red blood cells or too little hemoglobin in the cells.

    <p>True</p> Signup and view all the answers

    A person exposed to high-dose radiation or chemotherapy for cancer treatment can damage stem cells of the bone marrow, resulting in megaloblastic anemia.

    <p>False</p> Signup and view all the answers

    Secondary polycythemia is usually caused by increased erythropoietin (EPO) production in response to chronic hypoxia or from an erythropoietin-secreting tumor.

    <p>True</p> Signup and view all the answers

    Pregnancy is among the conditions associated with an increase in Hematocrit (PCV) value.

    <p>False</p> Signup and view all the answers

    Hematocrit value increases in conditions associated with hypoxia.

    <p>True</p> Signup and view all the answers

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