How does the blood—thymus barrier function to prevent premature stimulation of developing T cells?
What will be an ideal response?
The capillaries of the thymus resemble those of the CNS in that they do not permit free exchange between the interstitial fluid and the circulation. This lack of contact prevents the antigens from the circulating blood from stimulating the developing T cells prior to their release into the circulation.
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The ________ processes are vertical projections of the sphenoid bone that are important sites for attachment of muscles that move the lower jaw and soft palate.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the correct sequence of regions of the small intestine, from beginning to end?
A. Duodenum - ileum - jejunum B. Duodenum - jejunum - ileum C. Ileum - duodenum - jejunum D. Ileum - jejunum - duodenum E. Jejunum - duodenum - ileum
A tissue with a firm gel matrix and cells inside lacunae is
A) areolar connective tissue. B) cartilage. C) bone. D) epithelium. E) dense regular connective tissue.
Proteoglycans are composed of ________.
A. nucleic acids and proteins B. proteins and fats C. carbohydrates and proteins D. carbohydrates and fats E. nucleic acids and fats