[Biology Class Notes] on ADH Hormone Pdf

Antidiuretic hormone (ADH) is also called Vasopressin. This hormone controls a number of physical processes and prevents several life-threatening conditions, which include bleeding abnormalities and septic shocks. It is mainly involved in regulating and balancing the quantity of water within the blood and increasing the glomerular blood flow by increasing the vital sign. Higher concentrations of ADH tightens the blood vessels, which increases the vital sign. The ADH hormone is activated by the posterior pituitary lobe.

 

The antidiuretic hormone is secreted by the neurohypophysis of the pituitary gland. Since it stimulates the constriction of blood vessels and leads to a rise in vital sign, therefore it’s called vasopressin. The ADH is produced within the hypothalamus, which is stored and secreted by the pituitary which lies just beneath the bottom of the brain.

 

Functions of Antidiuretic Hormone

The antidiuretic hormone is involved in the:

1. Regulation of the circadian rhythm.

2. It is mainly responsible for homeostasis.

3. Maintains the proper cellular functions.

4. ADH actively monitors the quantity of water within the body and controls it.

5. It controls the blood pressure by acting on the kidneys and the blood vessels.

6. It allows the water within the urine to be taken back during a specific area within the kidney and thus, reduces the quantity of water excreted through the urine thereby conserves the body fluid.

 

Regulation of ADH

Several factors regulate the release of the ADH hormone into the bloodstream. These include: 

1. The decrease within the blood volume or vital sign is detected by the massive blood vessels and therefore the receptors present within the heart stimulate the discharge of ADH.

2. The increase in the concentration of salts within the bloodstream also controls the secretion of ADH, which is identified by special nerve cells within the hypothalamus.

3. Intake of alcohol also prevents the discharge of ADH. This causes dehydration and a rise in urine production.

4. If the amount of ADH is higher, the water is retained by the kidney within the body. When excess ADH is released when not required, the blood gets diluted reason, excess water retention.

5. The salt concentration in the blood thus decreases. High levels of ADH could also be caused thanks to the side-effects of medicine, lung diseases, etc. Increased ADH is related to leukaemia, lymphoma, bladder cancer, brain cancer, etc.

 

Hormones Levels and the Risk Factors of ADH

The low level of Antidiuretic hormone in the blood cells results in:

1. Diabetes insipidus.

2. Primary polydipsia.

3. Damage to the hypothalamus or pituitary gland.

4. A lot of water is excreted by the kidneys, which increases urine volume and lowers blood pressure.

High levels of ADH in blood cells results in:

1. Acute conditions – symptoms include nausea, vomiting, headache, dehydration, etc. Coma and seizures may also occur in severe cases.

2. An increase in ADH concentration may also include cancers of the lung, brain, pancreas, blood, etc., along with tuberculosis, epilepsy, emphysema, multiple sclerosis, cystic fibrosis, etc.

 

Disorders Of ADH

The disorders of the antidiuretic hormone associated with its high or low levels include.:

The disorders include:

• Infertility.

• Insomnia.

• Head injuries.

• Delayed puberty.

• Genetic disorders.

• Frequent urination.

• Change in appetite.

• Autoimmune disorders.

• Fluctuations in blood pressure.

• Fluctuations in body temperature.

• Tumours within the hypothalamus or regions near the pituitary.