Question

Observe the picture related to the defence mechanism of the body.
(a) What is this reaction?
(b) Prepare a flow-chart illustrating the different stages in this reaction.

Answer 1

a) The process is phagocytosis. Phagocytic cells in the human body play an important role in immunity.

$\begin{array}{c}\text{The antigen such as bacteria is engulfed by the white blod cell which}\\ \text{are phagocytic such as macrophages and monocvtes.}\end{array}$

$\downarrow$

$\text{A phagosome is formed inside the cell.}$

$\downarrow$

$\text{This phagosome fuses with the lysosome to form phagolysosome.}$

$\downarrow$

$\text{This phagosome fuses with the lysosome to form phagolysosome.}$