Competitive Exams

Human Body Blood Notes for Competitive Exams

Human Body Blood Notes for Competitive Exams

Blood is fluid connective tissue

  • pH of blood is 7.4
    • pH is a scale used to specify the acidity or basicity of an solution
    • pH of 7 is neutral
    • pH below 7 is acidic
    • pH above 7 is basic

Hence blood is basic

Quantity of blood is around 7-10% of body weight. Human body contains 5-6 litres of blood

  • Blood consists of two parts
    • Plasma
      • Plasma is 55%
      • Plasma contains 90% – Water, 10% – Protein, Salts and Glucose
      • Plasma is liquid part of blood.
      • Plasma transports oxygen, carbon di oxide, digested food and excretory material
    • Blood Cells / Corpuscles
      • Blood Cells / Corpuscles is 45%
      • Blood cells is divided into – RBC , WBC and Platelets
      • RBC – Red Blood Cells / Corpuscles
        • Biological Name of RBC is Erthrocytes
        • RBC has no nucleus and carry oxygen
        • RBC is present in large quantity
        • For every 600 RBC, there is 1 WBC i.e. RBC Count :WBC Count is 600:1 ratio
        • RBC is formed in bone marrow
        • RBC dies in spleen and liver.
        • SpleenLiver
        • Graveyard of RBC is liver
        • Lifespan of RBC is 90 – 120 days
          • Haemoglobin is part of RBC
          • Haemoglobin contains Haemo ( Iron – Fe 2+ ) and globin ( protein ). Blood is red in colour due to Iron in Haemoglobin. Globin helps combine oxygen and carbon di oxide and carry oxygen.
          • Diseases associated with haemoglobin is anemia and jaundice
      • WBC – White Blood Cells / Corpuscles
        • Biological Name of RBC is Levcocytes
        • WBC is formed in bone marrow
        • WBC dies in blood
        • Lifespan of WBC is 3 – 5 days
        • Quantity of WBC is less than RBC. RBC Count :WBC Count is 600:1 ratio
        • WBC forms antibodies. Antibodies protect us from diseases and infections.
        • AIDs/HIV causes deficiency of WBC
      • Platelets
        • Biological Name of Platelets is Thrombocyte
        • Platelets are present in human body and mammals
        • Platelets is formed in bone marrow
        • Platelets dies in blood
        • Lifespan of Platelets 3 – 5 days
        • When bleeding happens , clot is formed
        • Platelets help in blood clotting
        • Due to Dengue , platelets count is reduced

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