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  • Choose the incorrect statement  Option: 1 Red colour of erythrocytes is due to the presence of hemoglobin.  <

Choose the incorrect statement

 

Option: 1

Red colour of erythrocytes is due to the presence of hemoglobin.

 


Option: 2

Mammalian erythrocytes are enucleate and biconcave.

 


Option: 3

The nucleus and other organelles are lost during development and maturation of RBC.

 


Option: 4

Formation of RBCs occurs in bone marrow during embryonic stages


Answers (1)

best_answer
 

Erythrocytes or Red Blood Cells -

  • These are the cells which give blood its characteristic red colour. 
  • The red colour is due to the presence of an iron-containing compound called haemoglobin.
  • Mammalian erythrocytes are enucleated and biconcave. 
  • The biconcave shape is important as it provides a large surface-to-volume ratio to facilitate gas exchange. 
  • The nucleus and other organelles are lost during development and maturation of RBC. 
  • The number of RBC per microlitre of blood is about 5 million in men and 4.5 million in women. 
  • Formation of RBCs is called erythropoiesis. It takes place in the liver and spleen during embryonic stages. From birth onwards, it takes place in bone marrow. 
  • A term erythrocytopenia is used for denoting the decreased number of erythrocytes. 
  • Similarly, the term erythrocytosis or polycythemia is used to denote an increased number of erythrocytes.
  • The average lifespan of human erythrocytes is of 120 days. 
  • RBCs are important for the transport of oxygen and carbon dioxide, maintenance of pH in blood etc. 


 

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From birth onwards, RBC formation takes place in bone marrow.

Posted by

Shailly goel

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