The medical term for eardrum is:
A) external auditory meatus
B) pinna
C) tympanic membrane
D) cochlea
C
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A child who suffers from a persistent viral infection is found to have a deficiency in lymphocyte production and very few T and B cells
Other bone marrow-derived cells are produced in normal numbers, and MHC molecule expression on cells appears normal. Transfusion of mature T cells from an unrelated donor who had recovered from a previous infection by the same virus would not be expected to help the child clear his infection. Which one of the following is a reasonable explanation for why this therapeutic approach would fail? A. Viral infections are cleared by antibodies, not T cells. B. The patient's own immune system would destroy the transfused T cells before they could respond to the viral infection. C. T cells recognize peptides, not viral particles. D. Donor T cell viral antigen recognition is restricted by MHC molecules not expressed in the patient. E. In responding to the previous infection, the donor would have used up all his T cells specific for that virus.
Helicobacter pylori (H. pylori) bacteria are a cause of duodenal ulcers.?
Indicate whether the statement is true or false
Which of the following is true about the trachea?
A. The Adam's apple acts as a shield of cartilage for it. B. It is lined with mucous membrane and cilia. C. It connects directly to the bronchioles. D. The epiglottis covers it.
Read this selection: Addison disease is caused mostly by idiopathic atrophy of the adrenal cortex. Which of the following statements best describes the cause of Addison disease?
A. The adrenal cortex shrinks due to exogenous administration of corticosteroids. B. The adrenal cortex shrinks for unknown reasons. C. The adrenal cortex is enlarged due to increased hormone production. D. The adrenal cortex becomes diseased through viral infection and shrinks E. The adrenal cortex stops functioning due to a bacterial infection.