Lysosomes Flashcards
When are lysosomes formed?
When the vesicles produced by the Golgi contain enzymes such as proteases and lipases.
What other enzyme do vesicles contain?
Lysozymes.
What are lysozymes?
Enzymes that hydrolyse the cell walls of certain bacteria.
How many enzymes may a lysosome contain?
50
What size are lysosomes?
Up to 1.0 micrometres in diameter.
What do lysosomes do with the enzymes?
Isolate them from the rest of the cell before releasing them to the outside or into a phagocytic vesicle within the cell.
What are the functions of lysosomes?
Hydrolyse material ingested by phagocytic cells (WBC and bacteria), releases enzymes into the outside of the cell, digests worn-out organelles, and breaks down cells completely after they have died.
What is the outside of the cell called?
Exocytosis.
Why do lysosomes release enzymes into the exocytosis?
To destroy material around the cell.
Why do lysosomes digest worn-out organelles?
So the useful chemicals they are made of can be re-used.
What is the process of lysosomes breaking down cells after they have died called?
Autolysis.
Where are lysosomes abundant in?
Secretory cells like epithelial and phagocytic cells.
What do lysosomes hydrolyse?
Material ingested by phagocytic cells.
What do lysosomes release and where?
Enzymes into the outside of a cell.
What do lysosomes digest?
Worn-out organelles.
