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Role of Hormones and Kidney Functions in Water Balance

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Hormones and kidney functions influence the water levels in the body. Read the article to know more.

Medically reviewed byDr. Kaushal Bhavsar
Published At July 25, 2023
Reviewed AtOctober 16, 2024

Introduction:

Hormones and kidney function go hand in hand when it comes to maintaining water balance in the body. The kidney secretes various hormones that are crucial in maintaining water levels required by the body. Poor kidney functions can cause excessive water retention in the body, which can be harmful. It is important to balance the consumption and excretion of water to achieve a state of homeostasis. Homeostasis refers to maintaining the body in a state of equilibrium to regulate proper functions. Kidneys perform a wide variety of functions to ensure proper blood filtering from impurities and remove excess waste from the body. This article briefs about the role of hormones and kidney functions in maintaining water balance.

What Are Kidneys?

Kidneys are paired organs that are situated in the back of the abdomen. The primary function of the kidneys is to filter blood and remove waste materials from the body. In addition, they help to remove other wastes and balance body fluids. They are bean-shaped organs and are a crucial part of the urinary system. Individuals suffering from diabetes and high blood pressure are at a greater risk of kidney problems. In addition, accidents and trauma may also damage the kidneys.

What Are the Functions of Kidneys?

Kidneys clear out toxins from the body. The waste materials include nitrogen, creatinine, and acids. They help to filter the substances mentioned above from the body. The kidney performs the following functions:

  • Control acid-base balance.

  • Maintains sugar levels if the blood sugar levels are low.

  • Maintains renin, a protein to increase blood sugar levels.

  • Produces hormones like calcitriol and erythropoietin that aid in the absorption of calcium and the production of red blood cells, respectively.

The kidney filters blood with the help of nephrons, which are the filtering units. Each nephron has glomeruli and renal tubules.

  • The glomeruli are tiny blood vessels that perform the filtering of the blood and pass the filtered substance into the renal tubules. This process is called glomerular filtration.

  • The renal tubules help to reabsorb and return water and nutrients to the body based on the requirements. The waste products from the body are removed through a process called diffusion. The remaining waste is eliminated through the kidney’s collecting chambers. Finally, they are disposed of from the body through urine.

How Is Water Balance Maintained in the Body?

Water holds up to one-half of the average weight of the person. The water intake should be proportional to the water loss of an individual. To maintain the water balance and to protect against dehydration, it is important to drink plenty of water to avoid kidney stones. Drinking excess water helps to prevent kidney stones. The body obtains the water from the digestive tract, and a small amount is produced when the nutrients are metabolized. The water is excreted from the body through the kidneys via the urine. Several mechanisms are involved in maintaining water balance. They include,

  • Thirst.

  • Osmosis.

  • Pituitary gland interaction.

Thirst is an important mechanism for maintaining water balance. When the body needs water, it stimulates the nerve centers within the brain, resulting in the sensation of thirst. The sensation becomes stronger as the body requires water, urging the person to drink fluids. In the case of excess water, thirst is usually suppressed.

In osmosis, there is water flow from one compartment to the other. This allows larger volumes of fluid in the cells and the area around the cells. It acts as a reservoir and protects the cells from dehydration.

The pituitary gland also helps with water balance. When water levels are low, the gland secretes a hormone called vasopressin. This, in turn, stimulates the kidneys to excrete excess water through urine.

What Is the Role of the Kidney in Maintaining Water Balance?

Kidneys play a pivotal role in maintaining and regulating the water balance within the body. They filter the blood through nephrons. After the blood is filtered, a filtrate is formed. This contains water and electrolytes. Once the filtrate passes the nephron, it is selectively reabsorbed, and the essential minerals are retained. The reabsorption quantity depends on the hydration requirements of an individual.

The kidneys can also concentrate the urine to conserve water. This is done with the help of collecting ducts present in the nephron. In times of water scarcity, the kidneys excrete concentrated urine to minimize water loss from the body.

How Does Hormone Influence Water Balance?

Hormones are essential in maintaining balance within the body. Various hormones affect the water balance, either directly or indirectly. Some examples are given below:

  • The antidiuretic hormone, which is released by the posterior pituitary gland, acts on the kidney to increase water reabsorption. This is done by making the kidney tubules more permeable to water. Due to the increased permeability, more water gets reabsorbed back into the bloodstream. This aids in conserving water and reduces urine volume.

  • Aldosterone is another hormone that helps in regulating water balance. It acts on the kidneys and promotes sodium absorption and promotes potassium elimination which causes water retention. Increasing water retention helps to keep up the blood pressure and blood volume.

  • The thyroid hormones contribute to the water balance by indirectly affecting the metabolic rate of the kidneys and making changes in the reabsorption of water and electrolytes.

Conclusion:

Maintaining water balance is essential to perform daily cell functions. Generally, water is lost from the body in various forms, which include urination and sweating. In order to counter the lost water, the body performs various mechanisms to maintain the optimal water level. The common mechanism for maintaining water balance is to induce thirst, which in turn urges an individual to consume water. A few hormones like thyroid hormone, antidiuretic hormone, and aldosterone also help to maintain water levels in the body. Maintaining a balanced water level is essential for the optimal functioning of cells. Consuming less quantity of water can result in kidney stones which is a painful condition. Hence, it is important to consume the required levels of water as per the body's needs to lead a healthy life.

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Frequently Asked Questions

Kidneys play a vital role in maintaining blood pressure in a healthy range. Diseased kidneys cannot maintain a healthy blood pressure range, causing a rise in blood pressure. It is also visible in people with CKD (Chronic Kidney Disease); high blood pressure can worsen kidney disease and increase the risk of having heart problems.

Kidney disease refers to the damage or dysfunction of the kidneys. Detecting kidney disease in its early stages is very important. A few early signs of kidney damage are:


- Changes in urination.


- Swelling in different body parts such as legs, ankles, feet, and face.


- Fatigue and weakness.


- Shortness of breath.


- Hypertension (high blood pressure).


- Unintentional weight loss.


- Memory problems.

Low blood pressure has been linked to a higher incidence of chronic renal disease. Blood filtration removes toxins and extra fluid. In low blood pressure, there is less blood flow for filtration, causing reduced urine production. If the problem continues, low blood pressure can cause kidney problems.

Aldosterone is a steroid hormone that plays a crucial role in maintaining the balance of water and salts. It is secreted from the outer region of the adrenal cortex from the adrenal gland, which is located above the kidney. The balance of water in the body aids in maintaining blood pressure.

The kidneys maintain fluid balance with signals from hormones such as aldosterone, Antidiuretic Hormone (ADH), and Atrial Natriuretic Peptide (ANP). Aldosterone promotes sodium and water retention in response to low blood volume; ADH raises water reabsorption, and ANP increases sodium and water excretion in cases of increased blood volume. These hormones work together to regulate renal function and water and electrolyte balance in the body.

Antidiuretic Hormone (ADH) and aldosterone are hormones that may have interactive effects on kidney function. ADH, also called vasopressin, regulates the amount of water excreted by the kidneys. Whereas aldosterone helps to maintain proper water balance by increasing sodium reabsorption and potassium secretion from kidney tubule cells.

The kidney secretes three types of hormones: erythropoietin, renin, and calcitriol. Erythropoietin increases the bone marrow's red blood cell production at low oxygen levels. Renin helps regulate blood pressure, which influences fluid and electrolyte balance. The kidneys also activate calcitriol, which helps calcium absorption in the intestines.

Antidiuretic Hormone (ADH) is a hormone that plays an important role in regulating water excretion. However, other hormones also influence water excretion. The hypothalamus secretes ADH, and several factors influence the secretion of ADH.

The kidney is the vital organ that helps maintain the body's water balance. The kidneys can adjust the urine concentration to reflect the body's water needs. When the body is dehydrated, it helps conserve more water or makes urine more dilute to expel excess water when needed.

The water balance in the body is maintained through a combination of mechanisms. The kidney plays a crucial role in maintaining water balance with the help of hormones such as Antidiuretic Hormone (ADH) and aldosterone. The excretion of water from the body is based on the signals the kidney receives from hormones such as Antidiuretic Hormone (ADH) and aldosterone. Based on the received signals, the kidney adjusts urine concentration and volume.

During kidney failure, the kidneys will not be efficient enough to filter and remove excess water from the body. This leads to fluid retention in the bloodstream and tissues, causing edema. Individuals with kidney failure may experience symptoms of fluid overload, such as swelling in the legs and ankles.

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Dr. Kaushal Bhavsar from iCliniq
Dr. Kaushal Bhavsar

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