Which blood vessels experience the sharpest decrease in blood pressure?
A) systemic veins B) systemic arterioles
C) systemic venules D) systemic capillary beds
Answer: B
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Osteoclasts are
A) immature bone cells that give rise to osteocytes. B) cells that secrete bone matrix. C) mature bone cells that maintain the matrix. D) cells that break down bone matrix.
Which of the following is true for parathyroid hormone?
A) stimulates osteoblast activity. B) decreases the rate of calcium absorption. C) increase the rate of calcium excretion. D) lowers the level of calcium ion in the blood. E) inhibits calcitonin secretion.
Which of the following statements is true?
A. The first cervical vertebra is called the axis. B. The spinal cord protects the vertebral column. C. Thoracic vertebrae have long, thin spinous processes. D. The sacral vertebrae are superior to the lumbar vertebrae. E. Lumbar vertebrae are generally smaller than thoracic vertebrae.
Once cytotoxic T cells are produced, which of the following is (are) consistent with their ability to attack intracellular viruses?
A. Most nucleated cells process antigens through the MHC class I mechanisms. B. Viral antigens are processed by the MHC class I mechanism and are presented to the cell surface. C. Cytotoxic T cells bind to MHC class I processed antigens. D. Cytotoxic T cells bound to the MHC class I processed antigens release lymphokines. E. All of these choices are correct.