Ch23 Lymphatic System
Terms in this set (38)
Lymph entering the right lymphatic duct can come from the
Which of the following is a lymphatic organ?
Which is not a region where you would find clusters of lymph nodes?
In the foot
BUT YES In: the groin
Under the arm
In the neck
Which lymphatic organ is found in the superior mediastinum, which is posterior to the sternum?
Which of the following is NOT considered a component of the lymphatic system?
but yes: MALT
One of the major functions of the immune system is to maintain blood volume. How is this accomplished?
Fluid exits the blood capillaries such that normal pressures within the blood vessels are maintained. The excess fluid flows into lymphatic capillaries.
In comparison to veins, lymphatic vessels __________.
have overlapping endothelial cells that allow the passage of large materials
What is the primary function of the lymphatic system?
to protect the body from pathogens
Which of the following is NOT considered a major component of the lymphatic system?
BUT YES: adenoids
Superficial lymphatics __________.
are found in the hypodermis, or subcutaneous layer
Lymph in the thoracic duct empties into the
left subclavian vein.
The right and left lumbar trunks empty into the
The thoracic duct lies
anterior to the vertebral bodies.
Lymph leaving the lower limbs and returning to the trunk first passes through the __________.
inguinal lymph nodes
Through which structure does the majority of lymph flow?
What is the function of interleukin-7 in the red bone marrow?
It supports the differentiation of lymphoid stem cells into NK cells and B cells.
How does the thymus function in immunity?
The thymus produces thymic hormones that promote the differentiation (maturation) of T cells.
Which of the following cells produce and secrete antibodies?
plasma cells (plasmocytes)
B cells differentiate into plasmocytes. Antibody-mediated Immunity: Antibodies attach to specific targets.
Antibody-mediated Immunity: B cells mature in red bone marrow before they
Cytotoxic T cells attack and destroy foreign cells and viruses.
Cell-mediated Immunity: T cells mature in the thymus before they circulate.
Memory T cells are activated later by the same antigen.
NK cells police peripheral tissues for abnormal and cancer cells.
T cells require what event to occur in order to undergo activation?
Before lymph leaves a lymph node, it would encounter all of the following EXCEPT __________.
YES: dendritic cells
What is the attachment point on the lymph node for blood vessels and nerves?
What is the function of the blood-thymus barrier?
to prevent premature stimulation of developing T cells
Which of the following would occur if a disease selectively destroyed the reticular cells of the thymus?
The number of T cells activated would decrease.
Reduced numbers of what kind of cell are the most probable reason for the increase in the rates of cancer in the elderly?
The spleen __________.
contains a large number of macrophages, which remove foreign materials and damaged cells from circulation.
Upon entering a lymph node, the lymph first encounters __________.
As an individual ages, which of the following does NOT happen?
The spleen becomes more fibrous and decreases in size and weight.
BUT THIS DOES:T cells become less responsive.
B cell levels do not rise as dramatically after exposure to foreign antigens.
Immunological surveillance decreases as a result of lower NK cell populations.
In comparison to B cells and T cells, NK cells __________.
respond to a greater variety of pathogenic threats
Lipids absorbed in the digestive tract enter ________ in the intestinal wall.
Lymphatics carry lymph only from peripheral tissues to the ________.
Lymphoid nodules in the walls of the small intestine are called (the) ________.
If this mass continued to grow, what structure in the mediastinum might it press against, making breathing more difficult?
Compression of this blood vessel in the mediastinum would be a likely cause of the Jans' fainting.
common carotid arteries
This structure divides the thoracic cavity into right and left pleural cavities.
The T and B cells mentioned in this case are variants of what type of blood cell?