Vasopressin
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  Vasopressin



Vasopressin

    Hormone secreted by the posterior pituitary gland (trade name Pitressin) and also by nerve endings in the hypothalamus; affects blood pressure by stimulating capillary muscles and reduces urine flow by affecting reabsorption of water by kidney tubules.

RELATED TERMS
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Hormone
A chemical substance formed in the body that is carried in the bloodstream to affect another part of the body; an example is thyroid hormone, produced by the thyroid gland in the neck, which affects growth, temperature regulation, metabolic rate, and other body functions.

Posterior
At or toward the back.

Pituitary
The gland from which a number of hormones are released into the bloodstream. These hormones include growth hormone, ACTH, B-lipocortin (the precursor to B-endorphorin), FSH, LH, and TSH.

Gland
An organ that releases a chemical. Endocrine glands are ductless and secrete hormones directly into the bloodstream. Exocrine glands secrete externally, either through a tube or duct.

Nerve
Tissue that conveys sensation, temperature, position information to the brain.

Hypothalamus
The portion of the brain's limbic system that integrates incoming information, and either increases or decreases the release of certain hormones that instruct the pituitary gland to release hormones.

Affects
The feeling-tone accompaniment of an idea or mental representation. It is the most direct psychic derivative of instinct and the psychic representative of the various bodily changes by means of which instincts manifest themselves.

Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

Capillary
A small, blood-containing vessel connecting the veins and arteries.

Urine
The waste fluid secreted by the kidneys, transported by the ureters, stored in the bladder, and voided through the urethra.

Kidney
One of the paired organs that excrete urine. The kidneys are bean-shaped organs (about 11 cm long, 5 cm wide, and 3 cm thick) lying on either side of the vertebral column, posterior to the peritoneum, about opposite the twelfth thoracic and first three lumbar vertebrae.



SIMILAR TERMS
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Vasocidin
Vasocidin is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): prednisolone acetate; sulfacetamide sodium.

Vasocon
Vasocon is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): naphazoline hydrochloride.

Vasocon-a
Vasocon-a is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): antazoline phosphate; naphazoline hydrochloride.

Vasoconstriction
A reduction in the diameter of small arteries (arterioles) which is caused by constriction of the smooth muscle fibres in the wall of the arteriole. Vasoconstriction is an important method of increasing the blood pressure. In local areas of damage it prevents blood loss by haemostasis. Local vasoconstriction can be caused by nerve impulses to the smooth muscle from the sympathetic nervous system, by locally released prostaglandins, serotonin and Epinephrine.

Vasodepressors
A medication that raises blood pressure.

Vasodilation
Causing the widening or opening (dilation) of blood vessels.

Vasodilator
A medication that dilates or widens the opening in a blood vessel.

Vasography
A test done on a man to determine whether his vas deferens is blocked, preventing sperm from being ejaculated.

Vasotec
Vasotec is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): enalapril maleate.

Vasovagal
A transient vascular and neurogenic reactin marked by pallor, nausea, sweating, bradycardia and rapid fall in arterial blood pressure which can result in loss of consciousness.

Vasoxyl
Vasoxyl is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): methoxamine hydrochloride.



PREVIOUS AND NEXT TERMS
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Venlafaxine hydrochloride
An inhibitor of serotonin and norepinephrine reuptake, unrelated chemically to any other antidepressants, that potentiates neurotransmitter activity in the central nervous system, used as an antidepressant.

Vasculitis
Inflammation throughout the body of the blood vessels.

Vitiligo
An autoimmune skin disorder caused by attack of the immune system on the pigment-producing cells within the skin. The loss of the cells responsible for skin color result in milky white patches on the skin surface.

Varicose Veins
Varicose veins -swollen, purple veins- are common in the legs and around the vaginal opening during late pregnancy. In most cases, varicose veins are caused by the increased pressure on the legs and the pelvic veins, and by the increased blood volume.

Vasopressin

Vasoconstriction
A reduction in the diameter of small arteries (arterioles) which is caused by constriction of the smooth muscle fibres in the wall of the arteriole. Vasoconstriction is an important method of increasing the blood pressure. In local areas of damage it prevents blood loss by haemostasis. Local vasoconstriction can be caused by nerve impulses to the smooth muscle from the sympathetic nervous system, by locally released prostaglandins, serotonin and Epinephrine.

Von Willebrand's Disease
Von Willebrand's disease (vWD) is the most common hereditary coagulation abnormality described in humans. It arises from a qualitative or quantitative deficiency of von Willebrand factor (vWF), a multimeric protein that is required for platelet adhesion. It is known to affect humans and, in veterinary medicine, dogs.

Veterinary Medicine
Veterinary medicine is the application of medical diagnostic and therapeutic principles to companion, domestic, exotic, wildlife, and production animals.

Viagra
A substance that is used to treat erectile dysfunction. Viagra relaxes the smooth muscle of the penis to allow increased blood flow and erection. It belongs to the family of drugs called phosphodiesterase inhibitors. Also called sildenafil.

Virility
The property of being capable of copulation and procreation.

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