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Dr F.B.Irani
Define blood, Give its composition and
functions.
Name the plasma proteins, give their
normal values and functions.
Blood – is a liquid connective tissue derived from
mesoderm that fills the heart and blood vessels.
physical characteristics
 Colour - opaque red due to pigment- haemoglobin.
 Volume – average adult is 5 -6 L
(8% of body weight)
 pH -7.4 ( 7.38 – 7.42) alkaline in nature
 Taste - salty
 Viscosity – five times >water
 Specific gravity –
 It is the ratio of weight of blood to the weight of
an equal volume of water at 4∘C
 Sp. gr. of whole blood - 1.050-1.060 .
 Sp.gr. of RBC (1.090) is greater than that of
plasma (1.030)
Blood consist of two main parts-
1) Plasma – 55%
2 ) Cellular elements– 45% (PCV or
Haematocrit value)
1. Plasma – 55%
- Clear straw coloured fluid
- (bilirubin, carotene, Xanthine)
Composition
Water (91%) Solids (9%)
Pl. proteins Organic mol. Inorganic mol.
a)Plasma proteins (7% of solid) 6.4 to 8.3 gm%
1. Sr albumin (3-5gm% ) Mol. Wt - 69,000
2.Sr globulins(2-3gm%)Mol.Wt–90,000 – 1,50,000
(α1,2, β1,2, γ)
3.Fibrinogen(0.3gm%) Mol.Wt – 4,00,000 – 5,00,000
4. Prothrombin (40mg%) Mol. Wt -68,000
AGR (Albumin-globulin ratio)= 1.7 : 1
b) Organic molecules (1% of solids)
 Carbohydrates- Glucose
 Fats - Neutral fats, Phospholipids & Cholesterol
 NPN - Ammonia, Amino acids, Creatine, Creatinine,
Xanthine, Hypoxanthine, Urea & Uric acid
 Others- Hormones, Enzymes & Antibodies
c) Inorganic substances (1% of the solids)
- Na, K, Ca, Mg, Cl, I, Fe, Po4 and Cu.
d) Gases – O2, CO2& N2.
2. Cellular elements – 45%
a) RBC or Erythrocytes (5-6.5 millions / mm3 )
b) WBC or leucocytes (4000-11000/mm3)
c)Platelets or thrombocytes (1.5-4 lac/mm3 )
Withdraw
blood and
place in
tube
Centrifuge
Plasma(55% )
Buffy coat:
WBC &
platelets(<1% )
Erythrocytes
(45%)
SERUM
- Plasma minus clotting factor ( I, II, V, VIII )
is called Serum.
- Serum contains higher serotonin level (5HT) because
of break down of platelets during clotting.
- Use- 1. biochemical investigations
2. cell culture media
 Nutritive function –
- It carries glucose, amino acids, fatty acids,
vitamins, electrolytes from gut to tissues.
 Respiratory functions –
- It carries O2 from lungs to tissues & carries CO2
from tissues to lungs.
• Excretory functions –
- Transport metabolic waste products like
urea, uric acid and creatinine to excretory
organs for disposal.
•Transport function –
- hormones , enzymes & antibodies are
transported to target tissue to modulate
metabolic process .
 Protective function –
Imp. role in defense
-Phagocytosis- Neutrophils and monocytes
-Immune response -lymphocytes and gamma
globulins
-Detoxification and removal of foreign proteins -
Eosinophils
 Homeostatic function-
Imp. role in maintaining internal environment of
body.
-water and electrolyte balance of the body.
- Act as buffers- haemoglobin and plasma proteins
 Maintenance of body temperature –
regulates body temperature.
Reason:-
- specific heat of blood is high
-High heat conductivity of blood
- High latent heat of evaporation of blood
- Body color –
- Provides natural color to the body
- In anaemia and hypovolemia, body becomes pale
 Maintenance of blood pressure and osmotic
pressure -
 Viscosity help in BP maintenance
 Fibrinogen and globulins play an Imp. role in blood
viscosity because of asymmetrical shape.
 Albumin mainly exerts colloidal osmotic pressure
which help in exchange of fluid at tissue level.
 Storage function-
ready-made source of substances are
stored in it like glucose, water, proteins
and electrolytes
Function of plasma protein
1. Maintain colloidal osmotic pressure. (albumin)
2. Maintain viscosity of blood. (fibrinogen & globulin)
3. Maintain acid base balance in body.
4. Helps in coagulation of blood. (fibrinogen & prothrombin)
5. Provides immunity to body. (gamma globulin)
6. Reservoir of protein to body.
7. Transport of Co2, vit A,D,E, thyroxin, cortisol, bile salt, Cu.
8. Provide stability to blood and prevent Rouleaux formation.
(fibrinogen & globulin)
1) Hypoproteinaemia – generalized decrease in
levels of plasma proteins. Leads to severe edema.
- A/E - Dietary deficiency and starvation.
- Malabsorption syndrome like sprue.
- Liver diseases like hepatitis, cirrhosis.
- Renal diseases like nephrotic syndrome.
- Haemorrhage and extensive burns.
- Hereditary and Congenital inborn defect .
Hyperproteinaemia – Increase in plasma protein level.
A/E – Acute Inflammatory conditions
- Acute tissue destruction as in myocardial infarction
- Chronic inflammation and malignancies.
- Multiple myeloma – increase Bence Jones proteins.
LAQ-
1. Describe the composition & functions of blood.
SAQ-
1. Functions of blood
2. Plasma protein
 Plasmapheresis
 Fresh Frozen Plasma

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Blood

  • 2. Define blood, Give its composition and functions. Name the plasma proteins, give their normal values and functions.
  • 3. Blood – is a liquid connective tissue derived from mesoderm that fills the heart and blood vessels. physical characteristics  Colour - opaque red due to pigment- haemoglobin.
  • 4.  Volume – average adult is 5 -6 L (8% of body weight)  pH -7.4 ( 7.38 – 7.42) alkaline in nature  Taste - salty  Viscosity – five times >water
  • 5.  Specific gravity –  It is the ratio of weight of blood to the weight of an equal volume of water at 4∘C  Sp. gr. of whole blood - 1.050-1.060 .  Sp.gr. of RBC (1.090) is greater than that of plasma (1.030)
  • 6. Blood consist of two main parts- 1) Plasma – 55% 2 ) Cellular elements– 45% (PCV or Haematocrit value)
  • 7. 1. Plasma – 55% - Clear straw coloured fluid - (bilirubin, carotene, Xanthine) Composition Water (91%) Solids (9%) Pl. proteins Organic mol. Inorganic mol.
  • 8. a)Plasma proteins (7% of solid) 6.4 to 8.3 gm% 1. Sr albumin (3-5gm% ) Mol. Wt - 69,000 2.Sr globulins(2-3gm%)Mol.Wt–90,000 – 1,50,000 (α1,2, β1,2, γ) 3.Fibrinogen(0.3gm%) Mol.Wt – 4,00,000 – 5,00,000 4. Prothrombin (40mg%) Mol. Wt -68,000 AGR (Albumin-globulin ratio)= 1.7 : 1
  • 9. b) Organic molecules (1% of solids)  Carbohydrates- Glucose  Fats - Neutral fats, Phospholipids & Cholesterol  NPN - Ammonia, Amino acids, Creatine, Creatinine, Xanthine, Hypoxanthine, Urea & Uric acid  Others- Hormones, Enzymes & Antibodies
  • 10. c) Inorganic substances (1% of the solids) - Na, K, Ca, Mg, Cl, I, Fe, Po4 and Cu. d) Gases – O2, CO2& N2.
  • 11. 2. Cellular elements – 45% a) RBC or Erythrocytes (5-6.5 millions / mm3 ) b) WBC or leucocytes (4000-11000/mm3) c)Platelets or thrombocytes (1.5-4 lac/mm3 )
  • 12. Withdraw blood and place in tube Centrifuge Plasma(55% ) Buffy coat: WBC & platelets(<1% ) Erythrocytes (45%)
  • 13. SERUM - Plasma minus clotting factor ( I, II, V, VIII ) is called Serum. - Serum contains higher serotonin level (5HT) because of break down of platelets during clotting. - Use- 1. biochemical investigations 2. cell culture media
  • 14.  Nutritive function – - It carries glucose, amino acids, fatty acids, vitamins, electrolytes from gut to tissues.  Respiratory functions – - It carries O2 from lungs to tissues & carries CO2 from tissues to lungs.
  • 15. • Excretory functions – - Transport metabolic waste products like urea, uric acid and creatinine to excretory organs for disposal. •Transport function – - hormones , enzymes & antibodies are transported to target tissue to modulate metabolic process .
  • 16.  Protective function – Imp. role in defense -Phagocytosis- Neutrophils and monocytes -Immune response -lymphocytes and gamma globulins -Detoxification and removal of foreign proteins - Eosinophils
  • 17.  Homeostatic function- Imp. role in maintaining internal environment of body. -water and electrolyte balance of the body. - Act as buffers- haemoglobin and plasma proteins
  • 18.  Maintenance of body temperature – regulates body temperature. Reason:- - specific heat of blood is high -High heat conductivity of blood - High latent heat of evaporation of blood - Body color – - Provides natural color to the body - In anaemia and hypovolemia, body becomes pale
  • 19.  Maintenance of blood pressure and osmotic pressure -  Viscosity help in BP maintenance  Fibrinogen and globulins play an Imp. role in blood viscosity because of asymmetrical shape.  Albumin mainly exerts colloidal osmotic pressure which help in exchange of fluid at tissue level.
  • 20.  Storage function- ready-made source of substances are stored in it like glucose, water, proteins and electrolytes
  • 21. Function of plasma protein 1. Maintain colloidal osmotic pressure. (albumin) 2. Maintain viscosity of blood. (fibrinogen & globulin) 3. Maintain acid base balance in body. 4. Helps in coagulation of blood. (fibrinogen & prothrombin) 5. Provides immunity to body. (gamma globulin) 6. Reservoir of protein to body. 7. Transport of Co2, vit A,D,E, thyroxin, cortisol, bile salt, Cu. 8. Provide stability to blood and prevent Rouleaux formation. (fibrinogen & globulin)
  • 22. 1) Hypoproteinaemia – generalized decrease in levels of plasma proteins. Leads to severe edema. - A/E - Dietary deficiency and starvation. - Malabsorption syndrome like sprue. - Liver diseases like hepatitis, cirrhosis. - Renal diseases like nephrotic syndrome. - Haemorrhage and extensive burns. - Hereditary and Congenital inborn defect .
  • 23. Hyperproteinaemia – Increase in plasma protein level. A/E – Acute Inflammatory conditions - Acute tissue destruction as in myocardial infarction - Chronic inflammation and malignancies. - Multiple myeloma – increase Bence Jones proteins.
  • 24. LAQ- 1. Describe the composition & functions of blood. SAQ- 1. Functions of blood 2. Plasma protein