When a person is suffering from poor renal reabsorption,...

When a person is suffering from poor renal reabsorption, which one of the following will not help in the maintenance of blood volume?
(a) Increased ADH secretion
(b) Decreased glomerular filtration
(c) Increased arterial pressure in kidneys
(d) Decreased arterial pressure in kidneys

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Key Concepts

Renal Reabsorption

Renal reabsorption is the process where the kidneys reclaim water and essential solutes from the filtrate back into the bloodstream. It is crucial for maintaining blood volume and electrolyte balance. When this process is impaired, the body must compensate through other mechanisms to preserve fluid levels.

Glomerular Filtration Rate (GFR)

The glomerular filtration rate measures the volume of blood filtered through the kidney's glomeruli per unit time. It is a key indicator of kidney function and plays a vital role in fluid balance. Alterations in GFR, such as reducing it, can be a compensatory mechanism to limit further fluid loss when reabsorption is compromised.

Antidiuretic Hormone (ADH) Secretion

ADH is a hormone that increases water reabsorption in the kidneys, particularly in the collecting ducts. Elevated levels of ADH help the body retain water, which is essential for maintaining blood volume, especially under conditions where renal reabsorption is poor.

Renal Arterial Pressure

Renal arterial pressure influences blood flow and the filtration process in the kidneys. Increased arterial pressure can boost the efficiency of filtration and support mechanisms that help maintain blood volume, whereas decreased arterial pressure would likely impair these processes, making it less effective in preserving blood volume.

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