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.
      • 
      • 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