A&P 2 CH. 20 Flashcards
Protein-containing fluid within lymphatic vessels.
Stores blood platelets.
Receives lymph from most of the body.
Small organs intimately associated with lymphatic vessels.
Largest lymphatic organ.
Isolated clusters of lymph follicles found in the wall of the small intestine.
Peyer's patches are clusters of lymphoid tissue found primarily in the large intestine.
The lymphatic capillaries function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream.
Lymph capillary permeability is due to minivalves and protein filaments.
Lymphatic capillaries are permeable to proteins.
Digested fats are absorbed from the intestine by the lymph capillaries.
Chyle is delivered to the blood via the lymphatic system.
There are more efferent lymphatic vessels leaving a lymph node than there are afferent vessels entering a lymph node.
About 3 liters of fluid are lost to the tissue spaces every 24 hours and are returned to the bloodstream as lymph.
Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics.
Lymphoid tissue is mainly reticular connective tissue.
Lymphocytes reside temporarily in lymphoid tissue, then move to other parts of the body.
All the lymphoid organs are well developed before birth.
Like blood, lymph flows both to and from the heart.
When tissues are inflamed, lymphatic capillaries develop openings that permit uptake of large particles such as cell debris, pathogens, and cancer cells.
The cisterna chyli collects lymph from the lumbar trunks draining the upper limbs and from the intestinal trunk draining the digestive organs.
If even a small part of the spleen is left in a ten-year-old child, it will most likely regenerate itself.
In the spleen, red pulp is involved in the immune functions and white pulp is involved in disposing of worn-out RBCs.
The most important role of the spleen is to provide a site for lymphocyte proliferation and immune surveillance and response.
The simplest lymphoid organs are the lymph nodes.
Small organs associated with lymphatic vessels are termed ________.
Which of the following would not be classified as a lymphatic structure?
Which of the following statements regarding the thymus is not true?
It has follicles similar to those in the spleen
Lymph transport involves all but which of the following?
smooth muscle contraction in the lymph capillary walls
The thymus is most active during ________.
Which lymphatic structure drains lymph from the right upper limb and the right side of the head and thorax?
right lymphatic duct
Which of the following is not a part of the lymphatic system?
The lymphatic capillaries are ________.
more permeable than blood capillaries
Antibodies that act against a particular foreign substance are released by ________.
Lymph leaves a lymph node via ________.
efferent lymphatic vessels
Which cells become immunocompetent due to thymic hormones?
Functions of the spleen include all of those below except ________.
forming crypts that trap bacteria
When the lymphatic structures of a limb are blocked due to tumors, the result is ________.
severe localized edema distal to the blockage of that limb
Select the correct statement about lymph transport.
Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles
Select the correct statement about lymphocytes.
B cells produce plasma cells, which secrete antibodies into the blood
Select the correct statement about lymphoid tissue.
Lymphoid tissue is predominantly reticular connective tissue.
Lymphoid tissue that appears as a swelling of the mucosa in the oral cavity is called a(n) ________.
53) Which of the following does not contain a mucosa-associated lymphatic tissue?
Peyer's patches are found in the ________.
ileum of the small intestine
Lymph capillaries are absent in all except which of the following?
What is a bubo?
an infected lymph node
The thymus is the only lymphoid organ that does not ________.
directly fight antigens
Large clusters of lymph nodes occur in all of the following locations except the ________.
Digestive tract-associated lymphatic tissue includes all of the following except ________.
islets of Langerhans
Which of the following is not a method that maintains lymph flow?
capillary smooth muscle contraction
The tonsils located at the base of the tongue are the ________.
Which of the following is not a normal component of lymph?
red blood cells
A sentinel node is ________.
the first node to receive lymph from an area suspected to be cancerous
Which of the following are functions of lymphoid tissue?
house and provide a proliferation site for lymphocytes and furnish an ideal surveillance vantage point for lymphocytes and macrophages
Which of the following is not a function of the lymphatic system?
transporting respiratory gases
Which of the following is not a function of lymph nodes?
produce lymph fluid and cerebrospinal fluid
The ________ are the simplest lymphoid organs and are found at the entrance to the pharynx.
The appendix, tonsils, and Peyer's patches are examples of ________.
Highly specialized lymph capillaries called ________ are present in the villi of the intestinal mucosa.
Splenic ________ pulp is primarily concerned with immune functions of the spleen.
Tonsils have blind-ended structures called ________.
Thymic corpuscles are always found in the lighter-colored ________ regions of the thymus.
The ________ pulp of the spleen forms cuffs around the central arteries.
Lymphatic ________ are formed from the union of the largest collecting vessels.
What is the consequence of obstruction of the lymphatics?
edema distal in the body to the obstruction
Where are the lymph node aggregations most dense?
near the body surface in the inguinal, axillary, and cervical regions of the body.
What is the special role of the thymus gland?
By secreting hormones, the thymus gland causes T lymphocytes to become immunocompetent
List the functions of the spleen.
remove aged or defective blood cells and platelets from the blood and to store or release some of the breakdown products of RBCs to the blood for processing by the liver
How is the skeletal system tied to the lymphatic system?
The lymphatic system removes excess fluids in the periostea. The lymphocytes protect the bones from pathogens. Parts of the skeletal system produce the lymphocytes found in the lymphatic system.