Formed Elements of Blood Quiz
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Questions and Answers

What is the average lifespan of erythrocytes in the human body?

  • 180 days
  • 60 days
  • 120 days (correct)
  • 90 days
  • Which type of white blood cell is the most abundant in the bloodstream?

  • Basophils
  • Monocytes
  • Eosinophils
  • Neutrophils (correct)
  • What protein is responsible for the red color of erythrocytes?

  • Keratin
  • Hemoglobin (correct)
  • Myoglobin
  • Collagen
  • Leucocytes are characterized by which of the following features?

    <p>They are nucleated and colorless.</p> Signup and view all the answers

    Which white blood cell type secretes histamine and is involved in inflammatory reactions?

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

    The fluid that surrounds cells and is derived from blood is known as what?

    <p>Interstitial fluid</p> Signup and view all the answers

    What is the average concentration of erythrocytes in a healthy adult man's blood?

    <p>5.0 - 5.5 million cells/mm³</p> Signup and view all the answers

    Which of the following is not a type of white blood cell?

    <p>Red blood cell</p> Signup and view all the answers

    What fluid is collected by the lymphatic system?

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

    Which organisms possess an open circulatory system?

    <p>Arthropods and molluscs</p> Signup and view all the answers

    Which type of circulatory system allows for precise regulation of fluid flow?

    <p>Closed circulatory system</p> Signup and view all the answers

    What type of heart do fishes possess?

    <p>2-chambered heart</p> Signup and view all the answers

    In amphibians and reptiles, how is blood managed in their circulatory system?

    <p>They possess a single atrium with mixed blood</p> Signup and view all the answers

    What distinguishes the circulatory system in birds and mammals from that of amphibians and reptiles?

    <p>Presence of a 4-chambered heart</p> Signup and view all the answers

    What is the role of lymphocytes in the lymphatic system?

    <p>Facilitating immune responses</p> Signup and view all the answers

    Where are fats primarily absorbed in the lymphatic system?

    <p>Lacteals in the intestinal villi</p> Signup and view all the answers

    Signup and view all the answers

    Study Notes

    Formed Elements of Blood

    • Erythrocytes (red blood cells, RBCs) are the most abundant blood cells
    • Healthy adult males have 5-5.5 million RBCs per mm³ of blood
    • RBCs are produced in red bone marrow
    • Mature RBCs lack a nucleus and are biconcave
    • RBCs contain hemoglobin, an iron-containing protein that gives them their red color and facilitates respiratory gas transport.
    • Healthy individuals have 12-16 grams of hemoglobin per 100 ml of blood
    • RBCs have a lifespan of 120 days and are destroyed in the spleen
    • Leucocytes (white blood cells, WBCs) are colorless due to lack of hemoglobin
    • Average WBC count is 6000-8000 per mm³ of blood
    • WBCs are nucleated and generally short-lived
    • WBCs are categorized into granulocytes (neutrophils, eosinophils, basophils) and agranulocytes (lymphocytes, monocytes)
    • Neutrophils are the most abundant WBC type (60-65%)
    • Basophils are the least abundant WBC type (0.5-1%)
    • Neutrophils and monocytes are phagocytic, defending against foreign organisms
    • Basophils release histamine, serotonin, and heparin, involved in inflammation
    • Eosinophils resist infections

    Body Fluids and Circulation

    • Interstitial fluid is the fluid between cells, formed from blood plasma, enabling nutrient/gas exchange between blood and cells
    • Lymph is formed from interstitial fluid
    • The lymphatic system collects and returns interstitial fluid to the blood
    • Lymph contains lymphocytes, crucial for immune responses
    • Lymph also transports nutrients and hormones
    • Fats are absorbed into the lymphatic system via lacteals in the intestinal villi

    Circulatory Pathways

    • Circulatory systems can be:
      • Open (blood pumped into body cavities) found in arthropods and mollusks
      • Closed (blood always contained in vessels) found in annelids and chordates
    • All vertebrates have a muscular, chambered heart
    • Fish have a 2-chambered heart (single circulation)
    • Amphibians and most reptiles possess a 3-chambered heart (incomplete double circulation)
    • Crocodiles, birds, and mammals have a 4-chambered heart (double circulation)
    • Mammals and birds have a double circulatory system where oxygenated and deoxygenated blood don't mix

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    Description

    Test your knowledge on the formed elements of blood, including erythrocytes and leucocytes. Learn about their composition, function, and lifespan in this informative quiz. Ideal for biology students and anyone interested in human physiology.

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