Ed Rivers, a 3rd year medicalstudent, was alone in the hospital ER one night. It was unusuallyquiet that night, and the resident was getting some much neededsleep. A patient, Mrs. X, was brought in showing signs of seriousdehydration. Ed tried to give here water, but she vomited this backup. Feeling he must try something, and not wanting to wake theresident, Ed administered 1 liter of sterile distilled water IV.Assume for simplicity that the red blood cells contain only solutesto which the rbc membrane is impermeable, and that the rbcs andplasma are in osmotic equilibrium when the patient is brought in.The osmolarity of the rbc is 300 mOsm/L.
1. Predict the direction (increase,decrease, no change) you would expect Edââ¬â¢s infusion to haveproduced in these parameters, and explain your predictions in termsof what you know from lecture and lab.
a. Mrs. Xââ¬â¢s plasma osmolarity after theinfusion
Prediction:
Why?
b. Mrs. Xââ¬â¢s rbc volume after the infusionequilibrates with blood?
Prediction:
Why?
c. The osmolarity of the rbcs and plasmaafter equilibration?
Ed Rivers, a 3rd year medicalstudent, was alone in the hospital ER one night. It was unusuallyquiet that night, and the resident was getting some much neededsleep. A patient, Mrs. X, was brought in showing signs of seriousdehydration. Ed tried to give here water, but she vomited this backup. Feeling he must try something, and not wanting to wake theresident, Ed administered 1 liter of sterile distilled water IV.Assume for simplicity that the red blood cells contain only solutesto which the rbc membrane is impermeable, and that the rbcs andplasma are in osmotic equilibrium when the patient is brought in.The osmolarity of the rbc is 300 mOsm/L.
1. Predict the direction (increase,decrease, no change) you would expect Edââ¬â¢s infusion to haveproduced in these parameters, and explain your predictions in termsof what you know from lecture and lab.
a. Mrs. Xââ¬â¢s plasma osmolarity after theinfusion
Prediction:
Why?
b. Mrs. Xââ¬â¢s rbc volume after the infusionequilibrates with blood?
Prediction:
Why?
c. The osmolarity of the rbcs and plasmaafter equilibration?
