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Solution


Q.

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.              [2016]
1 Erythrocytes  
2 Leucocytes  
3 Neutrophils  
4 Thrombocytes  

Ans.

(4)

Thrombocytes are called blood platelets. They are minute disc-shaped cell fragments in mammalian blood. They are formed as fragments of larger cells found in red bone marrow; they have no nucleus. They play an important role in blood clotting and release thromboxane A?, serotonin and other chemicals, which cause a chain of events leading to the formation of a plug at the site of the damage, thus preventing further blood loss. A reduction in their number can lead to clotting factors which will lead to excessive loss of blood from the body.