Which function is carried out by all lymphoid tissues and organs?
c. Extramedullary hemopoiesis
d. Production of lymphocytes
e. Destruction of old erythrocytes
Which structure is partly encapsulated and covered by nonkeratinized stratified squamous epithelium?
e. Thymic (Hassal’s) corpuscle
Which cell type gives rise to both memory and effector cells and is primarily associated with humoral immunity?
Recycling of iron and heme, the major complex containing iron, occurs most actively in which lymphoid organ(s)/tissue(s)?
Which description is true of all secondary (peripheral) lymphoid organs?
a. Capable of antigen-independent lymphopoiesis
c. Contain epithelial-reticular cells
d. Lack connective tissue capsules
e. Contain lymphoid nodules
Which structure would be most heavily labeled by an immunohistochemical method targeting the CD8 surface antigen?
A baby is born with a cleft palate and a condition called DiGeorge syndrome, which involves failure of third and fourth pharyngeal pouch derivatives to develop properly. The palate defect is corrected surgically, but regarding the pharyngeal pouch defect the parents are advised that the growing child may expect which of the following health problems?
a. Insufficient B-cell production by lymph nodes in the head and neck
b. Inability to secrete IgA
c. Excessive numbers of circulating but defective erythrocytes
d. Increased oral infections due lack of palatine and pharyngeal tonsils
e. Conditions related to autoimmunity
Many immune-related cellular activities are often impaired in aged patients. Which lymphoid organ(s) normally develop less functionality and increasing amounts of adipose tissue with age?
A 12-year-old African-American girl presents with anemia and a large percentage of her peripheral erythrocytes appear sickle-shaped. Genetic testing reveals homozygosity for sickle cell disease. In which of the following sites will the abnormal RBCs be removed from the circulation?
b. Periarteriolar lymphoid sheathes of splenic white pulp
c. Medullary sinuses of lymph nodes
e. Splenic cords (of Billroth)
A 6-year-old boy is brought to the clinic where his mother reports that was bitten by a neighbor’s dog two days earlier. The child’s right hand is lacerated between the thumb and index finger and this area is inflamed but healing. The doctor’s examination reveals small but painless swellings beneath the skin inside the right elbow and arm pit and he explains to the mother that these are active lymph nodes enlarged in response to the infection in the hand. What has produced the swelling?
a. Increased flow of lymph through the nodes’ afferent lymphatics
b. Formation of germinal centers for B-cell proliferation in each node’s cortex
c. Arrival of antigen-presenting cells in each node’s medulla
d. Enlargement and increased activity of the nodes’ high endothelial venules
e. Increased thickness of each node’s paracortex