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
- Plasma