BLOOD RBC, WBC, PLATELETS BIOLOGY NOTES FOR SSC

Here in the post BLOOD RBC, WBC, PLATELETS Biology Notes for SSC CGL exam. Here, we have also covered Blood Groupings and RH factor.

BLOOD RBC, WBC, PLATELETS

Biology notes of BLOOD RBC, WBC, PLATELETS for SSC and UPSC EXAMS

 
Blood is a fluid connective tissue. It quantity is 6.8 litres in man and 500 ml less in the woman. It constitutes 6-8% of body weight and ahs a pH of 7.4.

Three types of Blood Cells: –
1)Red Blood Cells(RBC)
2)White Blood cells (WBC)
3)Platelets

Red Blood Corpuscles (RBC): –

  • They are also called erythrocytes, disc shaped, no nucleus.It contains a pigment which is called Haemoglobin, which gives blood its red color and transports oxygen and carbon dioxide
  • Red blood cells are manufactured in Bone marrow
  • The Life of Red Blood Cells is 120 days. Number of RBCs is 4.5 – 5 million/ cubic mm of blood

White Blood Corpuscles (WBC): –

  • Also called leukocytes, they are rounded with a nucleus and far less numerous than RBCs(8,000 per cubic mm of blood)
  • Manufactured in Red Bone marrow
  • Act as the soldiers of Body’s defence system

Platelets: –

  • Also called thrombocytes and are about 2,50,000 per cubic mm of blood
  • Manufactured in red Bone marrow
  • It helps the blood to clot

Blood Groupings

  • Father of Blood Grouping : Karl Landsteiner
  • He discovered A, B and O blood groups
  • Decastello and Sturle discovered AB blood groups
Blood Group Can donate to Can receive from
A A,AB A,O
B B,AB B,O
AB AB A,B,AB,O
O A, B, AB, O O

RH factor

  • It is a blood antigen found in RBC
  • A person can be Rh+ or Rh- depending upon the presence of Rh factor in RBC
  • Rh+ can receive blood from both Rh+ and Rh- but Rh- can receive blood only from Rh- only
  • Blood transfusion techniques was developed by James Blundell

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