Immunoglobulins that are found on the surface of B cells and may activate antibody production are
A) IgA.
B) IgD.
C) IgE.
D) IgG.
E) IgM.
Answer: B
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What is the correct order for the vertebral regions, from superior to inferior?
A. Thoracic - cervical - lumbar - coccygeal - sacral B. Cervical - thoracic - sacral - coccygeal - lumbar C. Thoracic - sacral - lumbar - cervical - coccygeal D. Cervical - thoracic - lumbar - sacral - coccygeal E. Thoracic - coccygeal - cervical - lumbar - sacral
In October 2001 at the site of the World Trade Center in New York City, fires were still burning from the terrorist attacks that had brought down the buildings. The greatest danger to the respiratory system was
A. very large particles of debris. B. very small particles of debris. C. the odor. D. falling material from damaged buildings.
Which of the following is mismatched?
A. opening of sodium channels - depolarization B. closing of calcium channels - plateau phase C. opening of potassium channels - rapid repolarization D. closure of sodium channels - early repolarization E. opening of calcium channels - plateau phase
Which of the following is not true of a thoracic vertebra?
A. It usually has a facet at the end of each transverse process for attachment of a rib. B. The body is more massive than those of cervical vertebrae but less than those of lumbar vertebrae. C. The body has facets as points of articulation for ribs. D. It has a pair of transverse foramina. E. The spinous process is pointed and angled sharply downward.