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Question

Question: Mark the false statement....

Mark the false statement.

A

Erythrocytes are the most abundant blood cells

B

Liver and spleen are the erythropoietic organs of fetus

C

Proteins are the second largest constituents of plasma

D

Monocytes are associated with allergic reactions

Answer

Monocytes are associated with allergic reactions

Explanation

Solution

The question asks to identify the false statement among the given options regarding blood components and functions.

Let's analyze each statement:

  1. Erythrocytes are the most abundant blood cells: Erythrocytes (Red Blood Cells or RBCs) are indeed the most numerous type of blood cells in the human body, accounting for about 4.5 to 5.5 million cells per cubic millimeter of blood. Their primary function is oxygen transport. This statement is true.

  2. Liver and spleen are the erythropoietic organs of fetus: In the early stages of fetal development, erythropoiesis (the process of red blood cell formation) primarily occurs in the yolk sac. As development progresses, the liver becomes the main site of erythropoiesis, followed by the spleen. Later, bone marrow takes over as the primary erythropoietic organ. Thus, the liver and spleen are significant erythropoietic organs during fetal life. This statement is true.

  3. Proteins are the second largest constituents of plasma: Blood plasma is approximately 90-92% water. Proteins constitute about 6-8% of the plasma. Therefore, after water, proteins are the most abundant components of plasma. This statement is true.

  4. Monocytes are associated with allergic reactions: Monocytes are a type of agranulocyte white blood cell. They differentiate into macrophages in tissues and are primarily involved in phagocytosis, antigen presentation, and general immune responses. Allergic reactions are primarily mediated by basophils and mast cells, which release histamine, and by eosinophils, which are involved in detoxifying histamine and combating parasitic infections. Monocytes are not primarily associated with allergic reactions. This statement is false.

Therefore, the false statement is that monocytes are associated with allergic reactions.