Blood:-Explain The Blood

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Human blood is red coloured, opaque, viscous fluid having 4.7 viscosity . It is slight heavier than tha water and its specific gravity is 1.050-1.060. It has an osmotic pressure of 6.7 and PH 7.4 It means it is slightly alkaline in nature.

The amount of blood in human body is about 7-8% of body weight. There is about 5-6 liters of blood in the body of an adult human being. The branch of science which deals with the study of blood is called Haematology.

blood explain the blood

Blood is of mesodermal origin. It consists of two part:

(1)Plasma

(2)Blood Corpuscles


Plasma:-


Plasma is pale coloured, slighty alkaline clear, transparent non-living fluid. It constitutes about 55% of the blood. The components of plasma are:

Water                                   90-91%

Inorganic substance                  1%

Plasma proteins                          7%

Other organic substance             1%

Inorganic substance include chlorides, carbonates, bicarbonates, sulphates and phosphates of sodium, Photassium , calcium and magnesium.

Among organic substance plasma proteins like albumins, Globulins fibrinogen and prothrombin constitute about 7% of plasma . All these proteins are soluble and present in colloidal from plasma. Therefore they make the plasma viscous and regular osmotic pressure. Albumins are smallest among these and form 53% of all plasma proteins. These proteins maintain osmotic pressure of the blood. Globulin proteins from 43% of the total plasma proteins . They are of three type alpha(α), beta(β) and gamma(γ). Alpha and beta globulins transport proteins of different parts of the body, While globulins protect the body from infections. Prothrombine and fibrinogen help in conagulation of blood and form 4% of plasma proteins.

Glucose, aminoacids, Fstty acid, glycerol and vitamins as end products of digestion, urea, uricacid, creatinine as excretory products and enzymes and hormones are also present in plsma as organic substance.


Blood corpuscles:-


Blood  corpuscles form about45% of the blood.

Blood corpuscles are of following three types:-

  1. Erythrocytes or red blood corpuscles RBC

  2. Leucocytes or White blood Corpuscles WBC

  3. Blood platelets.