During a high-altitude desert trek, an explorer experiences severe dehydration, leading to a significant drop in the water potential of their blood plasma.
Describe how the endocrine and renal systems coordinate to restore the water potential of the blood plasma back to its normal physiological level.
Explain the physiological impact of this uncorrected, low water potential on the red blood cells.
17 exam-style questions on Edexcel IGCSE Biology Excretion. Each one has a worked solution and a mark scheme showing where the marks go.