Question: Which process-diffusion, osmosis, or filtration-is used in the following situations? a. Injection of a drug hypertonic to the tissues stimulates pain. b. The urea concentration

Which process-diffusion, osmosis, or filtration-is used in the following situations?
a. Injection of a drug hypertonic to the tissues stimulates pain.
b. The urea concentration in the dialyzing fluid of an artificial kidney is decreased.
c. A person with extremely low blood pressure stops producing urine.

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