Which of the following forces does not contribute to keeping the alveoli open?
a. alveolar surface tension
b. transmural pressure gradient
c. pulmonary surfactant
d. Movement of air between alveoli through pores of Kohn
e. None of the above contribute to keeping the alveoli open.
A
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When new, viable cells replace dead cells, the process is called
A) remuneration. B) replacement. C) regeneration. D) reunification. E) Either replacement or regeneration is equally correct.
Catecholamines activate postsynaptic cells by ________.
A. inhibition of adenylate cyclase B. inhibition of calmodulin C. increased production of cyclic AMP D. increased Ca2+ influx into the target cell
If the thymus shrank and stopped functioning properly, we would expect to see an immediate decrease in the number of
A) B lymphocytes. B) NK cells. C) T cells. D) neutrophils. E) NK cells and T cells.
The axial skeleton is composed of:
A. all skeletal structures below the pelvis. B. the skull, face, thoracic cage, and vertebral column. C. the upper and lower extremities. D. the ribs, pelvic girdle, and upper and lower extremities.