a widespread system of tissues and vessels. Its organs are not in continuous order but are scattered throughout the body , and it services almost all regions.
One way system that begins in the tissues and ends when the lymph joins the blood.
smallest lymph vessels
closed at one end - one way system
tethered to surrounding tissue by protein filaments
endothelial cells loosely overlapped - wide gaps
allow bacteria and cells entrance to lymphatic capillary
creates valve-like flaps that open when interstitial fluid pressure is high, and close when it is low
large vessels with valves, which collect and carry lymph to lymph nodes - include superficial and deep sets and are named according to location - lymphatic vessels carry lymph away from regional nodes and eventually drain into one or 2 terminals vessels ( Right lymphatic duct or thoracic duct) - both of which empty into the bloodstream
Right Lymphatic Duct
short vessel 1/2 in long that receives only the lymph that comes from the bodys superior right quadrant - the right side of the head, neck and thorax as well as the right upper extremity - it empties into the RIGHT SUBCLAVIAN VEIN near the heart - its opening is guarded by 2 pocket like semilunar valves to prevent blood from entering the duct.
Large LEFT lymph vessel in the chest that receives lymph from below the diaphragm and from the left side of the body above the diaphragm
Movement of Lymph
Segment of lymphatic vessels between valves contract rhythmically propelling lymph along. ,Lymph is moved by same mechanisms that promote venous return of blood to the heart.
Muscle contraction during movement compresses lymph vessels and drive lymph forward.,Changes in pressure within the abdominal and thoracic cavities caused by breathing aid in movement of lymph through these cavities.
tissues where antigens interact with cells of the immune system, Lymphocyte storage areas; examples: tonsils, spleen, appendix
Bean-shaped filters that cluster along the lymphatic vessels of the body. They function as a cleanser of lymph as wells as a site of T and B cell activation
the largest lymphatic organ in the body; serves as a blood reservoir, disintegrates old red blood cells, and produces lymphocytes and cleansing the blood of impurities and cellular debris by filtration and phatogocytes, producing red blood cells before birth.
the primary gland of the lymphatic system, located within the mediastinum; helps maintain the body's immune response by producing T lymphocytes - THYMOSIN - most active during early life.
three masses of lymphoid tissue that form a protective ring around the back of the nose and the upper throat - PALATINE TONSILS, PHARYNGEAL TONSILS ( ADENOIDS) AND LINGUAL TONSILS
A mass of lymphatic tissue at the befenning of the large intestine that helps trap ingested pathogens., A small, fingerlike extension of the vertebrate cecum; contains a mass of white blood cells that contribute to immunity.
consiSts of related cells responsible for the destruction of bateria, cancer cells, old blood cells - included among these cells are monocytes - relatively large white blood cells.
specific immunity produced by B cells that produce antibodies that circulate in body fluids, B cells, plasma cells, and antibodies
inguinal, Axillary, Cervical
The lymph nodes scattered throughout your body are mostly clustered in your groin, armpit, neck and throughout the torso. These are called ______,
____, and ____ lymph nodes
capillaries, lymphatic capillaries.
The poteins in interstitial space cannot reenter _______, but can enter ___________ __________?
Collecting vessels are similar to ________ but are ______ walled following along pathway of veins.
right lymphatic, rest of the body.
The ____ ______ duct, which receive lymph from right upper arm and right head and thorax, and thoracic duct, which serves the ____________?
Because it is an _____ system, it is a potential entrance into the cardiovascular system for debris and infection as well as fluid.
right lymphatic duct
collects lymph from the right side of the head and neck, the upper right quadrant of the body, and the right arm; empties into the right subclavian vein
The flow of returning fluid begins its
journey by entering ________ ________.
Two reasons why plasma leaves the capillaries: o______ pressure and b_____ pressure
Once plasma is collected from cardiovascular system to lymphatic capillaries it is now called T___ fluid, or L____.
right lymphatic, thoracic
The tube from the right side of the body is called the _____ ______ duct. The tube from the left is called the _____ duct.
The right lymphatic duct and the thoracic duct empty into the vasculature at the right and left _______ VEINS.