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Phagocytosis is the process of engulfing and digesting micro-organisms by phagocytes. Phagocytes are immune cells that are responsible for removing dead cells and microorganisms. Elimination of microbes by phagocytosis takes place in the following steps:

  1. The phagocyte comes near to the pathogen.

  2. The phagocyte adheres to the pathogen and surrounds them progressively.

  3. The phagocyte engulfs the pathogen and digests it.

Questions ( Click “comments” and type your answers):

1. Why is phagocytosis considered a non specific immune response?

Nour: 1- Because it is carried out by certain white blood cell types belonging to the innate (non-specific) immune system.

Aya: Phagocytosis is considered a non specific immune response because it is carried out by certain blood cell types belonging to the innate(non-specific) immune system.

2. What are the main phagocytes?

Nour: 2- The main phagocytes are: macrophages and leukocytes.

Aya: Macrophages, neutrophils, and monocytes are the main phagocytes.

3. What is so special about the phagocytosis done by macrophages?

Nour: 3- Macrophages are particularly important in the lymph system, liver, and spleen. In fact, amoeboid macrophages also travel throughout the body's tissues, feeding on bacteria and other foreign matter.

Aya: Macrophages attacks microbes as well as dead and infected cells.