The natural steroid hormones are generally synthesized from cholesterol in the gonads and adrenal glands. Steroid hormones are generally carried in the blood bound to specific carrier proteins such as sex hormone binding globulin or corticosteroid binding globulin. Further conversions and catabolism occurs in the liver, other "peripheral" tissues, and in the target tissues. Because steroids and sterols are lipid soluble, they can diffuse fairly freely from the blood through the cell membrane and into the cytoplasm of target cells. In ...

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Steroid hormone, Steroid hormone - Overview, Steroid hormone - Synthesis, Steroid hormone - Principal natural human steroid hormones, Steroid hormone - Synthetic steroids and sterols

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All actions of the hormone are inhibitory. Somatostatin's main actions are: inhibits the release of growth hormone (GH) inhibits the release of thyroid stimulating hormone (TSH) suppresses the release of gastrointestinal hormones gastrin cholecystokinin (CCK) secretin motilin vasoactive intestinal peptide (VIP) gastric inhibitory polypeptide (GIP) enteroglucagon (GIP) prolongs gastric emptying, gall bladder contraction and ...

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Somatostatin, Somatostatin - Actions, Somatostatin - Synthetic substitutes

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Spironolactone can cause gastrointestinal problems fairly often. Since it also affects steroid receptors elsewhere in the body, it can cause gynecomastia, menstrual irregularities and testicular atrophy. Other side effects include ataxia, impotence, drowsiness and rashes. A carcinogenic effect has been demonstrated in rats. ...

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Spironolactone, Spironolactone - Mechanism of action, Spironolactone - Pharmacokinetics, Spironolactone - Side effects

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In individuals of normal weight, water is abundant in most parts of the body, except in adipose tissue (fat). These calculations are for adults of average build, and are inappropriate for obese or overly muscular people. These proportions are very simplified and use round numbers for quick calculation. In males about 60% of the body mass is water. This value is about 55% in women due to a higher proportion of body fat. This is the total body water. Of this water, two-thirds of it is in the cells, and is called intracellular w ...

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Body water, Body water - Calculation of body water, Body water - Measurement of body water, Body water - Conditions associated with abnormal body water

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11β-OH CAH resembles 21-hydroxylase deficient CAH in its androgenic manifestations: partial virilization and ambiguous genitalia of genetically female infants, childhood virilization of both sexes, and rarer cases of virilization or infertility of adolescent and adult women. The mineralocorticoid effect differs: hypertension is usually the clinical clue that a patient has 11- rather than 21-hydroxylase CAH. Diagnosis of 11β-OH CAH is usually confirmed by demonstration of marked elevations of 11-deoxycortisol and 11-deoxycorticosterone (DOC ...

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Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - What is CAH?, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - 11β-Hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - Pathophysiology of 11β-OH CAH, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - Mineralocorticoid aspects of 11β-OH CAH, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - Sex steroid effects of 11β-OH CAH, Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - Management of 11β-hydroxylase deficient CAH

Read more here: » Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency: Encyclopedia II - Congenital adrenal hyperplasia due to 11 beta-hydroxylase deficiency - 11β-Hydroxylase deficient CAH

Symptoms are fairly nonspecific, and generally include malaise and muscle weakness; mild breathlessness may indicate metabolic acidosis, one of the settings in which hyperkalemia may occur. Often, however, the problem is detected during screening blood tests for a medical disorder, or it only comes to medical attention after complications have developed, such as cardiac arrhythmia or sudden death. During the medical history taking, a doctor will dwell on kidney disease and medication use (see below), as these are the main causes. The ...

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Hyperkalemia, Hyperkalemia - Signs and symptoms, Hyperkalemia - Diagnosis, Hyperkalemia - Differential diagnosis, Hyperkalemia - Ineffective elimination from the body, Hyperkalemia - Excessive release from cells, Hyperkalemia - Excessive intake, Hyperkalemia - Pathophysiology, Hyperkalemia - Treatment, Hyperkalemia - Reference

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Diagnosis is via a careful history and physical examination. Palpation of the abdomen during a test feed may reveal a mass in the epigastrium consisting of the enlarged pylorus (pyloric tumour) with palpable peristaltic waves consisting of the stomach trying to force its contents past the narrowed pylorus. Blood tests will reveal hypochloremic alkalosis secondary to loss of acidic gastric secretions due to persistent vomiting. A pediatric surgeon would typically be able to palpate a pyloric tumour in about 80% of cases. Such a ...

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Pyloric stenosis, Pyloric stenosis - Symptoms, Pyloric stenosis - Diagnosis, Pyloric stenosis - Pathophysiology, Pyloric stenosis - Treatment, Pyloric stenosis - Reference

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In both males and females, LH stimulates the production of sex steroids from the gonads. Leydig cells in male testes respond to LH by producing testosterone, while theca cells in the female ovary respond to LH by producing androgens and estrogens. In females, a LH surge about halfway through the menstrual cycle triggers the onset of ovulation. LH also induces the ovulated follicle to become the corpus luteum, which then secretes progesterone. LH levels are normally low durin ...

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Luteinizing hormone, Luteinizing hormone - Structure, Luteinizing hormone - Genes, Luteinizing hormone - Activity, Luteinizing hormone - Deficient LH activity, Luteinizing hormone - Excess LH activity, Luteinizing hormone - Availability

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The identity of GNRH1 was clarified by the 1977 Nobel Laureates Roger Guillemin and Andrew V. Schally: pyroGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly CONH2. ...

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Gonadotropin-releasing hormone, Gonadotropin-releasing hormone - Gene, Gonadotropin-releasing hormone - Structure, Gonadotropin-releasing hormone - GNRH1 as a neurohormone, Gonadotropin-releasing hormone - Control of FSH and LH, Gonadotropin-releasing hormone - Activity, Gonadotropin-releasing hormone - GNRH1 in other organs, Gonadotropin-releasing hormone - Medication, Gonadotropin-releasing hormone - Agonists and antagonists

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Endocrine system - In both sexes:. (starting from the head and going downwards) Hypothalamus Thyrotropin-releasing hormone (TRH) Gonadotropin-releasing hormone (GnRH) Growth hormone-releasing hormone (GHRH) Corticotropin-releasing hormone (CRH) Somatostatin Dopamine Pituitary gland Anterior lobe (adenohypophysis) GH (human growth hormone) PRL (prolactin)< ...

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Endocrine system, Endocrine system - Physiology, Endocrine system - Table of endocrine glands and the hormones secreted, Endocrine system - In both sexes:, Endocrine system - In males only, Endocrine system - In females only, Endocrine system - Role in disease

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The most common abnormal alleles of this condition impair both the 17α-hydroxylase activity and the 17,20-lyase activity. Like other forms of CAH, 17α-hydroxylase deficiency impairs the efficiency of cortisol synthesis, resulting in high levels of ACTH secretion and hyperplasia of the adrenal glands. Clinical effects of this condition include overproduction of mineralocorticoids and deficiency of prenatal and pubertal sex steroids. Congenital adrenal ...

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Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - What is CAH?, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Genetics of the various forms of P450c17 deficiency, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Pathophysiology and genetics of the various forms of P450c17 deficiency, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - 17α-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Mineralocorticoid effects of 17α-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Glucocorticoid effects of 17α-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Effects of impaired sex steroid synthesis in 17α-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - 1720-lyase deficiency, Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - Management of 17α-hydroxylase and 1720-lyase deficiencies

Read more here: » Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency: Encyclopedia II - Congenital adrenal hyperplasia due to 17 alpha-hydroxylase deficiency - 17α-hydroxylase deficient CAH

The two most serious neonatal consequences of 21-hydroxylase deficiency occur when there is minimal measurable hydroxylase activity from prenatal life: severe virilization of female infants and life-threatening salt-wasting crises in the first month of life for XX and XY infants alike. Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Virilization of female infants. Virilization of genetically female (XX) infants usually produces obvious genital ambiguity. Inside the pelvis, t ...

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Congenital adrenal hyperplasia due to 21-hydroxylase deficiency, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Genetics inheritance and incidence of 21-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Pathophysiology, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Severe early onset 21-hydroxylase deficient CAH, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Virilization of female infants, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Salt-wasting crises in infancy, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Sex assignment issues and controversies, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Long term management of CAH, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Preventing hyperandrogenism and optimizing fertility, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Psychosexual development and issues, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Newborn screening, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Prenatal diagnosis and treatment, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Childhood onset simple virilizing CAH, Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Late onset nonclassical CAH

Read more here: » Congenital adrenal hyperplasia due to 21-hydroxylase deficiency: Encyclopedia II - Congenital adrenal hyperplasia due to 21-hydroxylase deficiency - Severe early onset 21-hydroxylase deficient CAH

The diagnosis of pyloric stenosis is made when an infant has a history of progressive forceful vomiting. The pyloric valve (opening at the bottom of the stomach that regulates the stomach emptying) becomes bigger over time and blocks the stomach from emptying. The baby begins to lose weight, and may become dehydrated. Dehydrated means the baby is not keeping enough fluid in his body. The baby may show signs of being sleepy or not be as active as usual. The baby may not have had a wet diaper in several hours and the s ...

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Pyloric stenosis, Pyloric stenosis - Signs and Symptoms, Pyloric stenosis - Diagnosis, Pyloric stenosis - Pathophysiology, Pyloric stenosis - Therapy, Pyloric stenosis - Reference

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During pregnancy, the woman undergoes many physiological changes, which are entirely normal, including cardiovascular, renal, hematologic, metabolic or respiratory changes that become very important in the event of complications. Obstetrics - Metabolism. During pregnancy, both protein metabolism and carbohydrate metabolism are affected. One kilogram of extra protein is deposited, with half going to the fetus and placenta, and another half going to uterine contractile proteins, breast ...

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Obstetrics, Obstetrics - Antenatal care, Obstetrics - Symptoms, Obstetrics - Trimesters, Obstetrics - Overall, Obstetrics - Maternal physiology, Obstetrics - Metabolism, Obstetrics - Nutrition, Obstetrics - Cardiovascular, Obstetrics - Pulmonary, Obstetrics - Hematology, Obstetrics - Gastrointestinal, Obstetrics - Renal, Obstetrics - Endocrine, Obstetrics - Musculoskeleton and dermatology, Obstetrics - Others, Obstetrics - Prenatal Care, Obstetrics - First trimester, Obstetrics - Second trimester, Obstetrics - Third trimester, Obstetrics - Complications, Obstetrics - Fetal assessments, Obstetrics - Induction, Obstetrics - Labour, Obstetrics - Emergencies in obstetrics, Obstetrics - Imaging monitoring and care, Obstetrics - Antenatal record, Obstetrics - Imaging, Obstetrics - Terms and definitions

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Cholesterol - Synthesis and intake. Cholesterol is primarily synthesized from acetyl CoA through the HMG-CoA reductase pathway in many cells/tissues. About 20–25% of total daily production (~1 g/day) occurs in the liver; other sites of higher synthesis rates include the intestines, adrenal glands and reproductive organs. For a person of about 150 pounds (68 kg), typical total body content is about 35 g, typical daily internal production is about 1 g and typical daily dietary intake is 200 to 300 mg. Of the 1,200 to 1,300 mg input to the intestines (via bile production and food intake), abo ...

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Cholesterol, Cholesterol - History of the name, Cholesterol - Physiology, Cholesterol - Synthesis and intake, Cholesterol - Properties, Cholesterol - Regulation, Cholesterol - Function, Cholesterol - Excretion, Cholesterol - Role in atheromatous disease, Cholesterol - Cholesteric liquid crystals, Cholesterol - Sources

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Cortisol is an adrenal steroid hormone necessary for life; production begins in the second month of fetal life. Inefficient cortisol production results in rising levels of ACTH, which in turn induces overgrowth (hyperplasia) and overactivity of the steroid-producing cells of the adrenal cortex. The defects causing adrenal hyperplasia are congenital (i.e., present at birth). Cortisol deficiency in CAH is usually partial, and not the most serious problem for an affected person. Synthesis of cortisol shares steps with synth ...

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Congenital adrenal hyperplasia, Congenital adrenal hyperplasia - Overview of the multiple types of CAH, Congenital adrenal hyperplasia - Genetics, Congenital adrenal hyperplasia - Biochemistry, Congenital adrenal hyperplasia - History

Read more here: » Congenital adrenal hyperplasia: Encyclopedia II - Congenital adrenal hyperplasia - Overview of the multiple types of CAH

The amount of cortisol present in the serum undergoes diurnal variation, with the highest levels present in the early morning, and lower levels in the evening, several hours after the onset of sleep. Information about the light/dark cycle is transmitted from the retina to the paired suprachiasmatic nuclei in the hypothalamus. Changed patterns of the serum cortisol levels have been observed in connection with abnormal ACTH levels, clinical depression, psychological stress, and such physiological stressors as hypoglycemia, illness, fever, trau ...

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Cortisol, Cortisol - Synthesis, Cortisol - Physiology, Cortisol - Pharmacology, Cortisol - Diseases

Read more here: » Cortisol: Encyclopedia II - Cortisol - Physiology

Addison's disease - Early signs. Addison's disease progresses slowly, and symptoms may not present or be noticed until some stressful illness or situation occurs. Common symptoms are: chronic fatigue that gradually worsens muscle weakness loss of appetite weight loss nausea/vomiting diarrhea low blood pressure that falls further when standing (orthostatic hypotension) areas of hyperpigmentation (darkened skin), known as melasma suprarenal ...

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Addison's disease, Addison's disease - Signs and symptoms, Addison's disease - Early signs, Addison's disease - Addisonian crisis, Addison's disease - Diagnosis, Addison's disease - Pathophysiology, Addison's disease - Treatment, Addison's disease - Famous patients, Addison's disease - In animals, Addison's disease - Reference

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The hormone participates in calcium and phosphorus metabolism and it was found in fish, reptiles, birds and mammals. Most evidence points to that Calcitonin is not of physiological importance to humans, except for it's pharmacological use (see below). Specifically, calcitonin reduces blood calcium levels in three ways: decreasing calcium absorption by the intestines decreasing osteoclast activity in bones decreasing calcium and phosphate ...

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Calcitonin, Calcitonin - Synthesis, Calcitonin - Physiology, Calcitonin - Pharmacology, Calcitonin - History, Calcitonin - Reference

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Angiotensin - Vascular. It is a potent direct vasoconstrictor, causing arteries and veins to constrict and so leading to an increase in blood pressure. It also potentiates the release of norepinephrine by a direct action on postganglionic sympathetic fibres. Angiotensin - Brain. Angiotensin II acts on the brain to increase the sense of thirst via the subfornical organ (SFO), decrease the response of the baroreceptor reflex and increase the desire for salt. It also increases the secretion of vasopressin and A ...

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Angiotensin, Angiotensin - Angiotensinogen, Angiotensin - Angiotensin I, Angiotensin - Angiotensin II, Angiotensin - Effects of Angiotensin II, Angiotensin - Vascular, Angiotensin - Brain, Angiotensin - Adrenals, Angiotensin - Renal, Angiotensin - Other, Angiotensin - Angiotensin III & IV

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Antidiuretic hormone - Control. ADH is activated by "water receptors" in both the extracellular fluid volume and the intracellular fluid volume. In the extracellular fluid the activators are mainly baroreceptors in the veins, atria, and arterioles. In the intracellular fluid the activators are mainly osmoreceptors in the hypothalamus. Ethanol and caffeine block the release of ADH from the posterior pituitary gland. The resulting decrease in water reabsorption in the kidneys leads to a higher volume of urine output. See also:

Antidiuretic hormone, Antidiuretic hormone - Physiology, Antidiuretic hormone - Control, Antidiuretic hormone - Actions, Antidiuretic hormone - Structure and relation to oxytocin, Antidiuretic hormone - Pharmacology, Antidiuretic hormone - Role in disease

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Situated along the perimeter of the adrenal gland, the adrenal cortex mediates the stress response through the production of mineralocorticoids and glucocorticoids, including aldosterone and cortisol respectively. It is also a secondary site of androgen synthesis. The cortex can be divided into three distinct layers of tissue based on their organization. The most superficial cortical layer is the zona glomerulosa, which produces mineralocorticoids (eg, aldosterone). Beneath the glomerulosa are the zonae fasciculata and reticularis, which produce glucocorticoids (eg, cortisol) ...

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Adrenal gland, Adrenal gland - Overview, Adrenal gland - Adrenal medulla, Adrenal gland - Adrenal cortex, Adrenal gland - Zona glomerulosa, Adrenal gland - Zona fasciculata, Adrenal gland - Zona reticularis, Adrenal gland - Pathology, Adrenal gland - Blood supply, Adrenal gland - Related topics

Read more here: » Adrenal gland: Encyclopedia II - Adrenal gland - Adrenal cortex