Structure & function

appendix

tube-shaped sac attached to an opening into the large intestine that plays a role in immunity

B cell

nonthymus dependent, short-lived lymphocyte

lymph

a fluid collected from tissues throughout the body that contains mostly WBCs and flows through the lymphatic vessels

lymph node

located on larger lymph vessels in the cervical, mediastinal, axillary, and inguinal regions

lymphatic system

vessels, nodes, and capillaries that carry the lymph

leukocyte v. lymphocyte

WBC, WBC in lymphatic system

lymphoid nodules of the small intestine (Peyer’s patches)

collections of spherical masses of lymphoid cells closely packed together

macrophage, microphage

large, small phagocyte

monocyte

phagocyte

natural immunity

mother’s breast milk to baby

neutophil

phagocyte

phagocyte

WBC that clears pathogen and debris

reaction

action of an Ab on a specific Ag

spleen

gets rid of damaged WBCs and reclaims and stores iron

T cell

thymus dependent, long-lived

thymus

immune system gland located behind the sternum

tonsil

collection of lymph tissue; lingual, pharyngeal, palatine tonsils