lymph nodes Flashcards
lymph nodes are located in the
neck
armpits
groin
other parts of the body
defend us against
bacteria
covered by
capsule
2 sets of lymphatic vessels are connected to each
lymphatic node
afferent lymphatics bring
lymph from peripheral tissues
efferent lymphatics leave the
lymph node carrying lymph towards venous circulation
lymph nodes contain
macrophages
dendritic cells (responsible for starting an immune response, antigen presenting cells)
B cells
T cells
lymph node contains
- capsule
- subcapsular sinus
- germinal center
- lymphoid nodule
- trabeculae
FUNCTIONS
purifies lymph by removing
99% of the antigens
FUNCTIONS
macrophages engulf
debris and pathogens
process them and
present to lymphocytes
FUNCTIONS
protect against
pathogens and other antigens
FUNCTIONS
function as an
early warning system
FUNCTIONS
any infection in peripheral tissue stimulates the
macrophages and lymphocytes in nearby lymph nodes
FUNCTIONS
a swollen lymph node indicates
inflammation in peripheral tissues
FUNCTIONS
excessive enlargement is lymphadenopathy due to
bacterial or viral infections, cancer, etc
FUNCTIONS
dendritic cells (DC) are
antigen-presenting cells
FUNCTIONS
dendritic cells can stimulate
lymphocyte activity
antigen presentation is the
first step in the activation of the immune response
dendritic cells process
antigen material material and present it on the cell surface to the T cells of the immune system
dendritic cells act as messengers between the
innate and the adaptive immune systems
