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CBSE Class 9 Answered

<div>Write about the components of mammalian blood</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div> <div>&nbsp;</div>
Asked by Kulwinder | 27 Jun, 2017, 09:44: PM
Expert Answer

Mammalian blood is composed of plasma and three types of cells, red blood cells, white blood cells, and platelets.

Plasma

  • It is a light yellow-coloured alkaline liquid.
  • It mainly consists of water (90–92%), proteins (7–8%), inorganic salts (1%) and other substances (trace amounts). 

Cellular Elements

Red Blood Cells (RBCs/Erythrocytes)

  • RBCs are minute, disc-like structures.
  • In adults, RBCs are produced in the marrow of long bones.
  • In children, RBCs are produced in the bone marrow of all the cells until 5 years of age.
  • Mature RBCs do not have nuclei.
  • The average life of RBCs is 120 days.

White Blood Cells (WBCs/Leucocytes)

  • WBCs are amoeboid.
  • WBCs are produced in the bone marrow, lymph nodes and sometimes even in the liver and spleen.
  • The average life of WBCs is about 2 weeks.
  • WBCs are of different types-Neutrophils, Eosinophils, Basophils, Lymphocytes and Monocytes.

Functions of WBCs

  • Phagocytosis:
  • Inflammation:
  • Formation of Antibodies

Blood Platelets (Thrombocytes)

  • Blood platelets are minute, oval or round, non-nucleated structures floating in the blood.
  • Platelets are derived from megakaryocytes in the red bone marrow.
  • Their life span is 3 to 5 days.
  • Blood platelets play an important role in blood clotting.
Answered by Sheetal Kolte | 28 Jun, 2017, 11:15: AM

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