71. Types of lymphocytes Flashcards
1
Q
What is a lymphocyte
A
small leukocyte with round nucleus
mainly occurs in lymphatic system
2
Q
major classes of lymphocytes
A
B cells
T helper cells
T cytotoxic cells
natural killer cells
3
Q
How do lymphocytes develop
A
from bone marrow process haematopoiesis
originate from lymphoid progenitor cell
4
Q
what do natural killer cells do
A
defend host from tumours and virally infected cells
releases cell killing granules which destroy altered cells
5
Q
which cells are major components of adaptive immunity
A
b cells produce antibodies
t cells release cytokines/ killing granules
6
Q
why are memory t and b cells important
A
can recognise pathogen if it re enters the body
