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Cell structure
Lysosomes
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Lysosomes
Organelles that contain powerful
digestive
enzymes and have an
acidic
internal fluid
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Lysosomes
Contain powerful
digestive
enzymes such as
proteases
Have an
acidic
internal fluid due to the optimum pH of the
lysosomal
enzymes
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Phagocytosis
by white blood cells
1. White blood cell forms a
vacuole
around bacteria (
phagosome
)
2. Lysosomes fuse with the
phagosome
3.
Lysosomal
enzymes digest the
bacteria
4.
Soluble
digestion products pass into the
cytoplasm
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Degradation
of damaged or unwanted organelles
1. Organelle is surrounded by a
vacuole
2.
Lysosomes
fuse with the vacuole membrane
3.
Lysosomal
enzymes digest the organelle
4.
Digestion
products are absorbed into the cytoplasm and can be reused
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Exocytosis of lysosomal enzymes
1. Lysosomes transfer their enzymes
outside
of the
cell
2. To digest and
remove
unwanted proteins or
dead
cells
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Lysosomes play a key role in
phagocytosis
in
white
blood cells
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Lysosomes can be used to destroy
organelles
that are
damaged
or no longer functional
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Lysosomes can transfer their enzymes outside of the cell by
exocytosis
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