IB Biology Topic C3.2.5: Infection Control by Phagocytes Notes

Phagocytes Engulf and Digest Pathogens as a Non-Specific Defence

When you cut your finger, the area soon turns red and swollen.

This is the immune system in action, led by phagocytes, specialised white blood cells.

Phagocytes are part of the innate immune system and give a non-specific defence against any pathogen.

They recognise, engulf, and digest pathogens by a process called phagocytosis.

Definition

Phagocytosis

The process by which phagocytes engulf and digest pathogens.

Phagocytes Crawl to the Infection Using Amoeboid Movement

Phagocytes such as macrophages and neutrophils are not stuck inside blood vessels.

They reach infection sites by amoeboid movement, a crawling motion through tissues.

Chemotaxis: they detect chemical signals from damaged tissue or pathogens.

Diapedesis: they squeeze through capillary walls into the tissue.

Pseudopodia: extensions of the cell membrane pull the cell toward the infection.

Analogy

Think of phagocytes as firefighters answering an alarm.
They leave the station, cross the tissue, and reach the fire to put it out.

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(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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IB Biology Topic C3.2.5: Infection Control by Phagocytes Notes

Phagocytes Engulf and Digest Pathogens as a Non-Specific Defence

Phagocytes Crawl to the Infection Using Amoeboid Movement

Phagocytes Recognise, Engulf, and Digest the Pathogen

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Phagocytes Engulf and Digest Pathogens as a Non-Specific Defence

Phagocytes Crawl to the Infection Using Amoeboid Movement

Phagocytes Recognise, Engulf, and Digest the Pathogen

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C3.2.5: Infection Control by Phagocytes Notes

Phagocytes Engulf and Digest Pathogens as a Non-Specific Defence

Phagocytes Crawl to the Infection Using Amoeboid Movement

Phagocytes Recognise, Engulf, and Digest the Pathogen

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Phagocytes Engulf and Digest Pathogens as a Non-Specific Defence

Phagocytes Crawl to the Infection Using Amoeboid Movement

Phagocytes Recognise, Engulf, and Digest the Pathogen

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics