-collect "lost" fluid

-body defense/immunity

-lymphatic capillaries,vessels,trunks,collecting ducts,lyphm nodes

-lymphatic fluid:like plasma but contains more small proteins and more lipids

-additional lymphatic organs: spleen and thymus

-internal beaded wall; to increase surface areafor fluid/material collection

-closed-end capillary system;only one way return of fluid or materials

-large in diameter

-thin walled

-have valves

-afferent vessels take fluid into the lymph node. More fluid enters than leaves the lymph node.

-efferent vessels where fluid enters after it has been filtered by the lymph node.

- BIG

-always found in pairs.

-located at different parts of body as the next step to help put fluid back into circulation after it leaves the efferent vessel.

-Lumbar,intestinal,bronchomediastinal,subclavian and jugular trunk

-Capsule:outer covering of lymph node(superficial)

-Cortex:deeper structure that contains germinal center

-Germinal Centers:make lymphocytes to help in your immune defense

-Medulla: Core center of the lymph node that contains medullary cords.

-Medullary Cords: made of macrophages which help in your immune defense

-smooth muscle contraction in walls of blood vessel

-respiratory movements

-skeletal muscle contraction

-valves

-largest and longest

-collects fluid from below the diaphragm and the left side ofthe upper body.

-returns flid via subclavian vein.

-smaller duct

-collects fluid fro above the diaphragm and right side.

-returns fluid to the righ subclavian vein

-NOT a true collecting duct but acts like a reservoir

-located in the abdomen

-pools lymph in the abdomen and forwards it to a thoracic duct

"the lymph node of the circulatory system"

1. Red pulp:located externally and s responsible for RBC production termed extramedullary hematopiesis

2.White Pulp: located internally/ makes lymphocytes

-located between aorta and sternum

-contains lymphoid tissue

-has lymphoid tissue in its white pulp

-red pulp contains erythrocytes