Explanation:This question considers

Explanation:This question considers regulation of the circulatory system in the long term. Candidates need to consider theinfluence of different factors, sensors and responses.Compare salty water to fresh. Urine output changes slowly, to a lower degree, and for a longer time.(osmolarity swings cause quick death, volume disrupts ardiac output so blood pressure, which can bebuffered for a time by vessel constriction/relaxation).Osmolarity as above. Compare injection to drinking - the common effect on the blood produces thebiggest spike.There is a small spike after drinking, not driven by osmolarity, or changes to the blood. This is ananticipatory response before fluid is absorbed.After fesh water input, dilute urine is produced to remove it, and this is corrected by Y. After isosmoticinput, the urine will remain isosmotic.