Lymphatic System

Front 1

What are closed-eneded tubes that are found among most blood capillary networks?

Back 1

lymphatic capillaries

Front 2

When are lymphatic capillaries not found among blood capillaries?

Back 2

In the red bone marrow and central nervous system

Front 3

What are lymphatic capillaries?

Back 3

closed-ended tubes that are found among most blood capillary networks

Front 4

How are lymphatic capillaries similar to a blood capillary?

Back 4

its wall is an endothelium,

Front 5

How are lymphatic capillaries different than blood vessels?

Back 5

larger in diameter, lack a basement membrane, and have overlapping endothelial cells

Front 6

What do the overlapping endothelial cells do?

Back 6

act like one-way flaps: when interstitial fluid pressure rises, the margins of the endothelial cells push into the lymphatic capillary lumen and allow interstitial fluid to enter. When the pressure increases in the lymphatic capillary, the cell wall margin pushes back into place next to the adjacent endothelial cell. The fluid is now trapped in the lymph capillary and cannot be released back into the tissues.

Front 7

What does the small intestine contain?

Back 7

Special types of lymphatic capillaries called "lacteals" that pick up not only interstitial fluid, but also dietary lipids and lipid-soluble vitamins (vitamins that must be dissolved in lipids before they can be absorbed)

Front 8

What are lacteals and where are they located?

Back 8

special types of lypmhatic capillaries that pick up interstitial fluid and also dietary lipids and lipid-soluble vitamins (vitamins that must be dissolved in lipids before they can be absorbed), located in the small intestine

Front 9

What do lymphatic capillaries merge to form?

Back 9

lymphatic vessels

Front 10

How do lymphatic vessels resemble small veins?

Back 10

both contain 3 tunics (intima, media, externa), one-way vlaves

Front 11

What do the valves in the lymphatic vessels do?

Back 11

prevent lymph from pooling in the vessel and help prevent lymph backflow

Front 12

What helps move lymph through vessels?

Back 12

contraction of nearby skeletal muscles

Front 13

Lymphatic fluid passes repeatedly through what to be repeatedly examined for the presence of foreign/pathologic material?

Back 13

lymph nodes

Front 14

Explain the path of lymph

Back 14

Capillaries to vessels to muscles, lymph nodes all along the way examine the presence of foreign or pathogenic materials. Phagocytic cells eat bacteria here.

Front 15

What are formed by merging lymphatic vessels?

Back 15

lymphatic trunks