Q157 / 200 · NEET 2022 (Phase 1) · Zoology

Given below are two statements:

Statement I: The coagulum is formed of network of threads called thrombins.

Statement II: Spleen is the graveyard of erythrocytes.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
    Both statement I and statement II are incorrect
  • B
    Statement I is correct but statement II is incorrect
  • Correct answer
    C
    Statement I is incorrect but statement II is correct
  • D
    Both statement I and statement II are correct

Solution

Blood coagulation or clotting is a mechanism to prevent excessive loss of blood. The clot or coagulam is a dark reddish brown scum formed at the site of an injury. It is formed mainly of a network of threads called fibrins in which dead and damaged formed elements of blood are trapped. Fibrins are formed by the conversion of inactive fibrinogens present in the plasma by the enzyme thrombin. 

Erythrocytes or red blood cells are the most abundant of all the cells in blood. They have a red coloured, iron containing haemoglobin protein complex. RBCs have an average life span of 120 days after which they are destroyed in the spleen which is known as graveyard of RBCs.

Hence, the correct answer is option: 'C'.

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