Lymphatic System Flashcards
(27 cards)
How does fluid flow through the body?
Fluid flows through capillaries but some fluid (carrying
dissolved substances) leaks into the interstitial space
between cells.
T/F: Usually, filtration is greater than reabsorption.
True.
Where does excess filtrate go?
First it goes into the lymphatics as lymph, which returns excess interstitial fluid to the blood.
What are three general functions of the lymphatic system?
- Tissue Drainage
- Absorption
- Immunity
Why is tissue drainage important in the lymphatic system?
The lymphatic system prevents edema from building up. The CVS could fail if tissues became saturated with water.
What type of fluid is lymph identical to?
Interstitial Fluid.
What is the purpose of lymph fluid?
Transports plasma proteins that seep out of the capillary beds back to the blood stream, and carries away large particles.
What type of lymph vessels are small, blind-ended terminal lymph vessels that permeate almost every tissue of the body?
Capillaries
Which materials are absorbed into the lymphatic vessels?
Fats, fat-soluble materials, fat-soluble vitamins.
What are lacteals, and what do they do?
Lymphatic capillaries that transport lipids absorbed from the small intestine into lymphatic vessels and then into the blood.
Give 2 examples of primary lymphoid tissue.
Bone marrow and thymus gland.
How is loose lymphoid tissue described as?
No fixed structure with many lymphocytes.
What is MALT?
Collections of lymphoid tissue that are not enclosed in a capsule, contain B- cells and T-cells which are important in early defense.
What does it mean when MALT has no afferent lymph vessels?
It does not filter lymph.
Where can MALT be found?
Throughout the GI tract and the respiratory tract, all systems of the body exposed to the external environment.
What are large collections of lymphoid tissue found in small intestine & protect against swallowed antigens called?
Peyer’s Patches, or Aggregated Lymphoid Follicles.
What are lymph nodes?
Oval or bean-shaped organs that lie, often in groups, along the length of lymph vessels.
T/F: Lymph is filtered as it passes through the lymph node. Microbes, damaged cells and other material are removed by macrophages.
True.
What is the primary function of lymph nodes?
Proliferation of B and T lymphocytes.
Where do B and T lymphocytes originate?
Bone Marrow.
What proteins do B-lymphocytes produce?
Antibodies.
Where do T-lymphocytes mature?
In the thymus gland.
What do T-lymphocytes do?
Secrete chemicals that destroy bacteria, poisons, viruses, tumor cells, transplanted cells and cancer cells.
What is the largest lymph organ?
Spleen
