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Title: AQA AS BIOLOGY PHAGOCYTOSIS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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If a pathogen is to infect the body it must first gain entry
...
If this fails, the second line of
defence is the white blood cells
...
chemical products of pathogens or dead, abnormal cells
act as attractants, causing phagocytes to move towards
the pathogen
...
Phagocytes have several receptors on their cell-surface
membrane that recognise, and attach to, chemicals on
the surface of the pathogen
...
They engulf the pathogen to form a vesicle = known as a
phagosome
...
Lysosomes move towards the vesicle and fuse with it
...
They provide important defence
against pathogens that manage to enter the body
...
Enzymes called lysozymes are present within the lysosome
...
Some phagocytes travel in the blood but can move out of the blood
vessels into other tissues
...
The soluble products from the breakdown of the pathogen are absorbed into the cytoplasm of the phagocyte
...
This is
phagocytosis
Title: AQA AS BIOLOGY PHAGOCYTOSIS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.