Download Lymph Notes (Student Version)

Part I: The Lymphatic System
Consists of two semi-independent parts:
1. Lymphatic ________________
2. Lymphoid _____________ and ______________
 Lymphatic system functions
_______________ escaped fluids back to the ______________
o Plays essential roles in body ______________ and resistance to
______________
Lymphatic Vessels
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Lymph—excess tissue fluid and plasma proteins carried by lymphatic vessels
If fluids are not picked up, _____________ occurs as fluid accumulates in tissues
Lymphatic vessels pick up excess fluid (_______________) and return it to the blood
Lymphatic Vessels
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Lymphatic vessels (lymphatics)
o Form a ________-way system toward the heart
Lymphatic Vessels
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Lymph ______________
o Weave between tissue cells and blood capillaries
o Walls overlap to form flaplike minivalves
o Fluid leaks into lymph _________________
o Capillaries are anchored to connective tissue by ______________
o Higher pressure on the inside _____________ minivalves
o Fluid is forced along the ____________
Lymphatic Vessels
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Lymphatic collecting vessels
o Collect lymph from lymph capillaries
o Carry lymph ___ and __________ from lymph _____________
o Return fluid to circulatory veins near the heart
Right lymphatic duct drains the lymph from the ____________ arm and
the right side of the head and thorax
 Thoracic duct drains lymph from ____________ of body
Lymphatic Vessels
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Lymphatic vessels are similar to veins of the cardiovascular system
o ______-walled
o Larger vessels have _________
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o Low-pressure, ____________ system
Lymph transported is aided by:
o Milking action of skeletal muscles
o Pressure changes in thorax during breathing
o Smooth muscle in walls of lymphatics
Lymph Nodes
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Lymph nodes filter lymph before it is returned to the blood
Harmful materials that are filtered:
o ______________
o ____________
o ___________ cells
o Cell ___________
Lymph Nodes
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Defense cells within lymph nodes
o ___________________—engulf and destroy foreign substances such as
bacteria, viruses, and foreign cells
o ___________________—respond to foreign substances in the lymphatic
system
Lymph Nodes
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Most are kidney-shaped and less than 1 inch long and are buried in connective
tissue
_________ (outer part)
o Contains ________________—collections of lymphocytes
o Germinal centers enlarge when __________________ are released by
plasma cells
___________ (inner part)
o Contains phagocytic macrophages
Lymph Nodes

Flow of _________ through ____________
o Lymph enters the __________ side through ______________ lymphatic
vessels
o Lymph flows through a number of ________________ inside the node
o Lymph exits through ___________ lymphatic vessels
o Because there are fewer efferent than afferent vessels, flow is slowed
Other Lymphoid Organs
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Several other organs contribute to lymphatic function:
o _______________
o _______________
o _______________
o Peyer’s ____________