When sympathetic nervous system stimulation causes a substantial increase in precapillary resistance and a proportionately smaller increase in postcapillary resistance, the capillary pressure can decrease up to 15 mm Hg and, thereby, greatly increase the absorption of tissue fluid. This process is important. As mentioned earlier, fluid taken from the interstitial space can compensate for vascular volume loss during sweating, vomiting, or diarrhea. As water is lost by any of these processes, the plasma proteins are concentrated because they are not lost.
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