IB Biology: C3.2-The Role of Phagocytes in Control of Infection

Front

What are the characteristics of phagocytes?

Back

Phagocytes can be recognized by the lobed nuclei and granular cytoplasm.

Front

Where are phagocytes produced?

Back

Phagocytes are produced throughout life in the bone marrow.

Front

Where can phagocytes be found?

Back

They are found in the lymph nodes or the blood.

Front

How do phagocytes reach sites of infection?

Back

They squeeze out through pores in the walls of capillaries and move to sites of infection.

Front

What role do damaged tissues play in immune response?

Back

Damaged tissues release chemicals (e.g. histamine) which draw white blood cells to the site of infection.

Front

How do phagocytes deal with pathogens?

Back

They engulf pathogens by endocytosis and digest them with enzymes from lysosomes.

Front

What happens to pathogen fragments after phagocytosis?

Back

Pathogen fragments (antigens) may be presented on the surface of the phagocyte to stimulate an immune response by lymphocytes.

Front

Do phagocytes differentiate between types of pathogens?

Back

No, phagocytes do not differentiate between types of pathogens but respond the same way to all types of pathogens.

Front

What is the immune response by phagocytes called?

Back

This type of non-specific immune response is called non-specific immunity or non-adaptive or innate immune response.