Lymphatic system Flashcards
Lymph passes through lymph vessels and?
Lymph nodes before returning to the blood.
How is lymph formed?
Tissue fluid returns to the capillaries at their venous end, and the remainder diffuses through the more permeable walls of lymph capillaries.
What does the lymphatic system consists of?
Lymph Lymph vessels Lymph nodes Lymph organs: spleen, thymus Diffused lymphoid tissue: tonsils Bone marrow
Functions of the lymphatic System
1) Tissue Drainage
2) Absorption in the small intestine
3) Immunity
T:F The lymphatic system prevents tissue edema.
True
What transports lipids absorbed form the small intestine into the lymphatic vessels and ultimately into the blood?
Lacteals
Where are the Lacteals located?
In the villi
What are the white blood cells which are involved in the the immune response of the animal?
Lymphocytes
What organs are concerned with the production and maturation of lymphocytes?
Lymphatic Organs
T:F Bone marrow is considered to be lymphatic tissue?
True
Since lymphocytes are produced there
What is lymph?
A clear watery fluid, similar in composition to plasma, with the exception of plasma proteins, and identical in composition to interstitial fluid.
Functions of lymph
Transport plasma proteins
Carries away large particles
Contains Lymphocytes
What is lymph called after lacteals absorb fat giving lymph a milky appearance?
Chyle
What are the small blind-ended terminal lymph vessels permeate almost every tissue of the body?
Lymph capillaries: initial lymphatics
What is the difference between blood capillaries and lymph capillaries?
They are much more permeable to all intestinal fluid
Where does the lymph capillaries empty into the venous system?
Near the point where the point where the blood enters the right atrium.
What kind of muscle do the larger lymph vessels have?
Smooth muscle and elastic tissue
What ensures that lymph flows only one way?
Cup-shaped valves called semilunar valves
T:F The Lymphatic system has a pump that is involved in the movement of lymph.
False
There is no pump like the heart, the muscle layers in the walls of the lymph vessels has an intrinsic ability to contract rhythmically
What are the lymph nodes?
Oval or bean shaped organs that lie, often in groups, along the length of lymph vessels
What is the concave surface of the lymph node that an artery and vein enters and the efferent lymph vessel leaves?
Hilum
Functions of the lymph nodes?
Filtering and phagocytosis
Proliferation of lymphocytes
Functions of the spleen
Phagocytosis
Storage of blood and platelets
Immune response
T:F The thymus gland increases function as the animal ages
False
It is found in young animals and decreases in size and function as animal ages
