What causes lymph flow reduction during severe dehydration, impacting interstitial fluid drainage?

💡 Explanation

Dehydration reduces plasma volume and lowers capillary hydrostatic pressure, decreasing the pressure gradient needed for interstitial fluid to enter lymphatic capillaries; because filtration declines, lymphatic drainage suffers. Therefore, decreased hydrostatic pressure gradients impede lymph flow, rather than increased vessel contractility fully compensating.

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