S6: Phagocytosis Flashcards
1
Q
Who first observed phagocytosis under the microscope in a live animal?
A
Eli Metchnikoff (a Russian zoologist) in 1883
2
Q
What are the two types of phagocytes?
A
Free and fixed phagocytes
3
Q
What are free phagocytes?
A
Phagocytes that circulate in the blood and are free to migrate anywhere in the body as required
4
Q
What are fixed phagocytes?
A
Cells of the reticuloendothelial system (RES) that monitor the blood circulating through the RES
5
Q
What is the reticuloendothelial system (RES)?
A
A large system made up of cells located in the spleen and liver, bone marrow, and connective tissue.
6
Q
What is a phagosome?
A
A membrane within a phagocyte that surrounds engulfed foreign particles
7
Q
What are lysosomes?
A
Little sacs of digestive enzymes within the cytoplasm of a phagocyte
