00:01
So this question says, a mistake has been made on your floor to the hospital.
00:06
Somehow, instead of infusing one liter of isotonic saline solution into a patient, one liter of pure water was infused instead.
00:14
Isotonic solution should have been infused in this particular patient because the patient lost isotonic fluid due to a loss of plasma with a hemorrhage, and pure water will change the smallity of the extracellular fluid of this patient.
00:27
Assuming that before the infusion described above the patient's ecf and icf osmolarity were normal, this patient who received the pure water infusion will have.
00:37
So if this is one of the patient's cells, and this is the extracellular compartment, now normally this osmolarity here is the same as the osmolarity here, but if you are infusing pure water, this pure water does not have any solute.
01:01
So it is practically only water, without sodium, without any other electrolyte.
01:06
So in this case you are going to dilute this extracellular fluid, and if you dilute the extracellular fluid, the osmolarity is going to decrease.
01:17
And remember that osmolarity drags water to their compartments.
01:21
So in this case, this osmolarity is dragging water to the extracellular fluid, and this osmolarity is dragging water to the extracellular fluid.
01:29
And normally in homeostasis, the movement of them, or the osmolarity of them is the same, so no net water movement occurs during homeostasis...