Typically, a hilum of a lymph node contains
A. numerous efferent vessels.
B. one efferent lymphatic vessel.
C. one afferent lymphatic vessel.
D. numerous afferent vessels.
Answer: B
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Individuals who have been infected by the human immunodeficiency virus (HIV)
A. succumb to the disease in a relatively brief period of time after infection due to massive loss of B lymphocytes. B. always manifest symptoms early in the disease process. C. can be diagnosed only when they develop certain rare forms of cancer. D. generally are diagnosed by detection of anti-HIV antibodies or HIV RNA in their blood. E. have normal B-cell and cytotoxic T-cell function.
Ten-year-old Tina falls while climbing a tree and lands on her back. Her frightened parents take her to the local emergency room where she is examined. Her knee jerk reflex is normal and she exhibits a negative Babinski reflex. These results suggest that
A) Tina has injured one of her descending nerve tracts. B) Tina suffered no damage to her spinal cord. C) Tina has a spinal injury in the lumbar region. D) Tina has injured one of her ascending nerve tracts. E) Tina has a spinal injury in the cervical region.
Dynein is a mitochondrial enzyme
Indicate whether the statement is true or false