Label B represents which structure(s)?
A) circular folds
B) submucosa
C) muscularis externa
D) serosa
E) mucosa
A) circular folds
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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.
Hypernatremia is a plasma ________ concentration above normal.
A. K+ B. Cl- C. Ca2+ D. Na+ E. Pi
Define the following terms:
What will be an ideal response?
An autorhythmic heart cell is one in which
A. action potentials fire spontaneoulsy. B. action potentials are stimulated by internal stores of acetylcholine. C. action potentials always occur at exactly the same frequency. D. all filaments contract and relax with a high degree of synchrony. E. action potentials are initiated by the autonomic nervous system.