In the sodium-hydrogen antiport system,
A. both sodium ions and hydrogen ions are transported into the tubular lumen.
B. both sodium ions and hydrogen ions are transported into the tubular cell.
C. sodium ions are transported into the cell; hydrogen ions are transported out of the cell.
D. sodium ions are transported into the tubular lumen; hydrogen ions are transported into the cell.
E. sodium ions are transported out of the cell; hydrogen ions are transported into the cell.
C
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Mesangial cells help keep the basement membrane clean by
A. secreting emulsifying agents that dissolve trapped particles. B. engulfing macromolecules caught in its basement membrane. C. opening larger pores in the membrane so that trapped particles move accross. D. secreting antibodies that attack the molecules caught in the endothelium.
Steroids
a. are lipophilic. b. are derived from cholesterol. c. initiate the synthesis of specific new proteins within their target cells. d. are lipophilic and derived from cholesterol. e. all of these answers.
The lungs are located in the following cavities ________.
A) pleural, ventral, and thoracic B) mediastinum, thoracic, and ventral C) pleural, dorsal, and abdominal D) pericardial, ventral, and thoracic
Bone remodeling may occur
A. as bones grow. B. constantly during a person's lifetime. C. as fractures heal. D. as bones adjust to stress. E. All of the choices are correct.