nbme - guriyah

[ArchivalUser]

Although both vasopressin (ADH) and aldosterone significantly contribute to fluid and electrolyte balance, they do not appear to closely regulate blood volume in the long run. Blood volume is maintained at near normal levels in diabetes insipidus (absence of ADH) or Addison's disease (absence of aldosterone) because
(A) the peripheral renin-angiotensin system is stimulated
(B) salt and water intake are appropriately adjusted
© plasma oncotic pressure increases
(D) sympathetic reflexes decrease glomerular filtration
(E) renal blood flow decreases

[ArchivalUser]

D.

[ArchivalUser]

plz explain

[ArchivalUser]

In both diabetes insipidus and Addison's disease, appropriate water and salt intake will adequately compensate for the potential excess volume loss. If access to appropriate intake is prevented, however, tremendous volume loss will occur. All of the other changes listed in the question would tend to maintain blood volume, but all are either short-term effects or the result of extreme stimuli, such as hemorrhage or intense sympathetic activity.

[ArchivalUser]

D causes vasoconstriction as a result of dec Bp in the body due to either DI or Addisons disease.

[ArchivalUser]

thanks mehrban. u explained it well

[ArchivalUser]

answer should be B

[ArchivalUser]

yes i agree .it shud be B.

[ArchivalUser]

still wondering why not D....

[ArchivalUser]

me too wondering y not d