Margination refers to Margination refers to dilation of blood vessels. the movement of phagocytes through walls of blood vessels. the chemotactic response of phagocytes. adherence of phagocytes to the lining of blood vessels.

The correct answer is - adherence of phagocytes to the lining of blood vessels.

Explanation:

The proper functioning of phagocytes or white blood cells is not possible without the adherence ability of these cells to the vascular epithelium. So to facilitate the adhesion the phagocytes migrate towards the site through blood.

Margination is the adherence and accumulation of phagocytes on the blood vessel lining present at the injury site. It is a part of inflammatory response. The margination depends on various conditions like flow rate, red blood cell aggregation, local hematocrit, etc. Therefore the correct answer is-adherence of phagocytes to the lining of blood vessels.

Adherence of phagocytes to the lining of blood vessels.

Explanation:

Margination is the process of the movement of the selected particles across the walls of the particular channels. The particles can easilu undergo margination in blood.

The margination is useful for the clearance of the blood from the pathogens and separation of the effected cells. The margination is also performed by the immune cells especially macrophages for for the phagocytic activity and adherence with the blood vessels lining.

Thus, the correct answer is option (4).