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Questions and Answers
What is the primary function of hemoglobin in erythrocytes?
What is the primary function of hemoglobin in erythrocytes?
What percentage of whole blood is composed of plasma?
What percentage of whole blood is composed of plasma?
Which component serves a critical role in coagulation and blood clot formation?
Which component serves a critical role in coagulation and blood clot formation?
What is the normal range for hematocrit in men?
What is the normal range for hematocrit in men?
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What is the primary role of albumin in blood plasma?
What is the primary role of albumin in blood plasma?
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Which type of blood cell is primarily responsible for the immune response?
Which type of blood cell is primarily responsible for the immune response?
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How is carbon dioxide primarily transported in the blood?
How is carbon dioxide primarily transported in the blood?
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What is the average volume of blood in a healthy adult human?
What is the average volume of blood in a healthy adult human?
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What is the primary function of platelets in the blood?
What is the primary function of platelets in the blood?
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Which component of platelets is responsible for the storage of calcium ions?
Which component of platelets is responsible for the storage of calcium ions?
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During the clot removal process, which enzymes are involved?
During the clot removal process, which enzymes are involved?
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In hemophilia, what is the primary underlying issue?
In hemophilia, what is the primary underlying issue?
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What initiates primary platelet aggregation?
What initiates primary platelet aggregation?
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What is the average lifespan of red blood cells?
What is the average lifespan of red blood cells?
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What is the typical diameter of a red blood cell?
What is the typical diameter of a red blood cell?
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Which condition is characterized by abnormally shaped red blood cells?
Which condition is characterized by abnormally shaped red blood cells?
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What component is NOT part of the red blood cell structure?
What component is NOT part of the red blood cell structure?
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What happens to red blood cells in a hypertonic solution?
What happens to red blood cells in a hypertonic solution?
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Which of the following correctly describes anisocytosis?
Which of the following correctly describes anisocytosis?
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What percentage of a red blood cell's membrane consists of protein?
What percentage of a red blood cell's membrane consists of protein?
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Which of the following blood groups can be determined by the antigens on the surface of red blood cells?
Which of the following blood groups can be determined by the antigens on the surface of red blood cells?
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What percentage of hemoglobin composition is globin?
What percentage of hemoglobin composition is globin?
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Which of the following characterizes hypochromic hemoglobin?
Which of the following characterizes hypochromic hemoglobin?
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Which type of anemia is characterized by a bone marrow defect in infants?
Which type of anemia is characterized by a bone marrow defect in infants?
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What is the primary role of hemoglobin in the blood?
What is the primary role of hemoglobin in the blood?
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Which type of leukocyte is classified as agranulocytes?
Which type of leukocyte is classified as agranulocytes?
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What type of granules do neutrophils contain?
What type of granules do neutrophils contain?
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Which type of white blood cell is motile after leaving blood vessels?
Which type of white blood cell is motile after leaving blood vessels?
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What is the function of specific granules in eosinophils?
What is the function of specific granules in eosinophils?
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What is a characteristic of leukaemia?
What is a characteristic of leukaemia?
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Which type of white blood cell has the longest life span?
Which type of white blood cell has the longest life span?
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What is the normal range for platelet counts in blood?
What is the normal range for platelet counts in blood?
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Which type of granulocyte is primarily involved in allergic reactions?
Which type of granulocyte is primarily involved in allergic reactions?
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What is the primary function of neutrophils?
What is the primary function of neutrophils?
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What is the diameter of a typical platelet?
What is the diameter of a typical platelet?
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Which component of platelets is involved in adhesion?
Which component of platelets is involved in adhesion?
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Which of the following white blood cells is the largest?
Which of the following white blood cells is the largest?
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Study Notes
Blood
- Specialized connective tissue, viscous fluid
- Found in blood vessels and bone marrow
- Originates from mesenchyme
- Volume: 5 liters in healthy adult human
- 1 cubic millimeter of blood is equivalent to a microliter
-
Functions:
- Transport of gases, nutrients, waste products, hormones
- Regulation of pH and osmosis
- Maintenance of body temperature
- Protection against foreign substances
- Clot formation
Blood Composition
- 55% plasma + 45% blood cells
Hematocrit
- Volume percentage of red blood cells in the blood
- Erythrocytes constitute about 43% of the blood volume after centrifugation
- 47% ±5% in men
- 42% ±5% in women
- Buffy coat: Thin layer of leukocytes and platelets located between the erythrocytes and plasma.
Blood Film
- Blood film procedure:
- Clean slide
- Prick finger
- Put a drop of blood on a clean dry slide
- Put another slide on top at 45° angle
- Move backward to touch the blood drop
- Move forward to spread the blood
- Stain with Leishman stain (mixture of eosin, methylene blue, and azures)
Plasma
- Comprises 55% of the blood volume
- Yellowish fluid
- Aqueous solution, pH 7.4
- Composition:
- Water (92%)
- Plasma proteins (7%):
- Albumin (osmotic pressure)
- Globulin (antibodies)
- Fibrinogen (coagulation)
- Organic and inorganic substances (1%)
Blood Cells (Formed Elements)
- Red blood cells (RBCs) or Erythrocytes
- White blood cells (WBCs) or Leukocytes
- Platelets or Thrombocytes
Red Blood Cells (RBCs) or Erythrocytes
- Also known as red blood corpuscles
- Characteristics:
- Rounded, biconcave discs
- 7.5 µm diameter, 2.6 µm thick at the rim, 0.75 µm thick in the center
- Non-nucleated, no organelles (not a true cell)
- Non-motile
- Suspended in an isotonic medium (plasma)
- Soft and plastic, change shape in capillaries
- Aggregated in small vessels, called Rouleaux
- Life span is about 120 days
Abnormal Red Blood Cell Shapes (Poikilocytosis)
- Example: Sickle cell anemia, inherited disease where red blood cells are abnormally shaped (sickle shape)
Red Blood Cell Count
- Normal:
- Male: 5-5.5 million/mm3
- Female: 4.5-5 million/mm3
- Increase: Polycythemia (erythrocytosis)
- Physiological: Individuals living at high altitudes (low O2 tension)
- Pathological: Congenital heart and hypoxic lung
- Decrease: Anemia
Red Blood Cell Structure
- Cell membrane: 40% lipid, 10% carbohydrate, 50% protein
- Cytoskeletons maintain cell shape
- Antigens on the surface determine blood group (A, B, O, and Rh)
Red Blood Cell Size and Osmotic Pressure
- Isotonic solution (plasma): Osmotic pressure of plasma = in RBCs
- Hypertonic solution: Water flows from low solute inside the cell to high solute outside the cell, leading to cell shrinking (crenation)
- Hypotonic solution: Water accumulates inside the cell leading to swelling (hemolysis)
Red Blood Cell Size Variations
- Normocyte: 6-9 um (7.5)
- Macrocyte: Larger than 9 um
- Microcyte: Smaller than 6 um
- Anisocytosis: High percentage of erythrocytes with great variations in size
Hemoglobin (Hb)
- Protein found in the cytoplasm of red blood cells
- Haem (4%) + Globin (96%)
- Normal:
- Male: 15.5 gm/L
- Female: 14 gm/L
- Hb normal: Normochromic
- Less than normal: Hypochromic
- Hb more than normal: Hyperchromic
- Hemoglobin carries O2 from lungs to tissues of the body
- Heme contains iron, a pigment
Anemia
- Causes:
- Decreased number of RBCs: Aplastic anemia, hemorrhagic anemia
- Decreased Hb
- Decreased hemopoietic factors (iron and vitamin B12)
- Haemolysis (breakdown of RBCs)
Red Blood Cell Adaptations for Function
- Biconcave discs: Increased surface area for gas exchange
- Plastic: Compress in narrow capillaries
- No nuclei or organelles: More space for Hb
- Glucose metabolism enzymes: Energy production
Leukocytes, WBCs
- Names: Leukocytes, white blood cells, WBCs
- Characteristics:
- True cells (with nucleus and organelles)
- Originate in bone marrow
- Spherical when suspended in blood plasma
- Become amoeboid and motile after leaving blood vessels and invading tissues
Types of Leukocytes
- Agranulocytes (Mononuclear): Contains non-specific granules only
- Lymphocytes
- Monocytes
- Granulocytes (Polymorphonuclear): Contains specific and non-specific granules
- Neutrophils
- Eosinophils
- Basophils
Granular Leukocytes
- Two types of granules:
- Non-specific (azurophilic): Lysosomes, stain darkly, present in all leukocytes
- Specific: Bind neutral, basic, or acidic stains and have specific functions
- Three types based on specific granule stain:
- Neutrophils: Neutral
- Eosinophils: Acidophilic
- Basophils: Basophilic
Differential Leukocytic Count
- Percentage of each type of leukocyte
Leukemia
- Cancer that begins in the bone marrow, causing an abnormal increase of immature white blood cells (blasts or leukemia cells)
- These cells are not fully developed
Agranulocytes vs Granulocytes
-
Agranulocytes:
- Monocyte: 2-8% of WBCs, few days lifespan, 20 micrometers diameter, basophilic cytoplasm, kidney-shaped nucleus, phagocytic function
- Lymphocyte: 20-40% of WBCs, 3 months to years lifespan, 7-8 micrometers diameter, basophilic cytoplasm, large rounded nucleus, immunity function
-
Granulocytes:
- Basophil: 0-0.5% of WBCs, few days (life span), 10-12 micrometers diameter, large basophilic specific granules, S-shaped bilobulated nucleus, allergy (Histamine and Heparin) function
- Eosinophil: 1-4% of WBCs, 8-12 days lifespan, 10-12 micrometers diameter, larger acidophilic specific granules, horse-shoe shaped nucleus, cytotoxic and allergy function
- Neutrophil: 50-70% of WBCs, 12-15 days lifespan, 10-12 micrometers diameter, small numerous specific granules, multilobulated nucleus, phagocytic function
Platelets (Thrombocytes)
- Non-nucleated (not a true cell), oval or disk-like cell
- 2-4 um in diameter
- Origin: Megakaryocytes (giant cells) in the bone marrow
- Normal platelet count: 200,000 to 400,000/mm3 of blood
- Life span: 5-10 days
- Structure:
- Peripheral zone (hyalomere): Rich in GAGs and glycoproteins, involved in platelet adhesion, marginal bundle of microtubules and microfilaments (actin, myosin) for shape maintenance, two membranes:
- Open canalicular system: Facilitates uptake of factors
- Dense tubular system: Derived from ER and stores Ca2+ ions
- Central zone (granulomere): Mitochondria, glycogen, and granules:
- Alpha: Proteins (clot factors)
- Delta: Calcium, enzymes (e.g. Serotonin)
- Lambda: Lysosomes
- Peripheral zone (hyalomere): Rich in GAGs and glycoproteins, involved in platelet adhesion, marginal bundle of microtubules and microfilaments (actin, myosin) for shape maintenance, two membranes:
Platelet Functions
- Control of hemorrhage
- Promote blood clotting
- Clot factors:
- Fibrinogen
- Plasminogen
- Thromboplastin
Role of Platelets in Controlling Hemorrhage
- Primary platelet aggregation: Platelets adhere together forming a platelet plug
- Secondary platelet aggregation: Release of glycoproteins enhances plug size
- Blood coagulation: Release of coagulation factors produces fibrin protein, forming a network that traps blood cells, creating a blood clot
- Clot retraction: Clot contracts due to interaction of platelet actin and myosin
- Clot removal: Vessel wall is restored with new tissue, and the clot is removed by plasma proteolytic enzymes (plasmin, plasminogen) and lambda granules (lysosomal enzymes)
Hemophilia
- Severe hemorrhage after injury
- Inherited genetic X-chromosome disorder, transmitted by females
- People with hemophilia have little or no clotting factors
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Description
Explore the fascinating world of blood, a specialized connective tissue vital for numerous bodily functions. This quiz covers blood composition, hematocrit, and the essential roles blood plays in transport, regulation, and protection in the human body.