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Questions tagged [endocrinology]

The area of physiology dealing with the production and effects of hormones.

Endocrinology is the study of the various hormones and their actions and disorders. Many organ systems may secrete and/or responds to hormones (e.g., the brain, lungs, heart, intestine, skin and the kidney), the clinical specialty of endocrinology focuses primarily on the endocrine organs, namely those organs whose primary function is hormone secretion. These organs include the pituitary, thyroid, adrenals, ovaries, testes, and pancreas.

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267 questions
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Leptin and fat mass?

I am interested in the relationship between blood leptin concentration and fat mass. It is well known that as fat mass increases, leptin increases. Have there been studies that look into whether the relationship is linear, or perhaps as fat mass…
Biochic
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Steroid hormones: how do they travel through the cytoplasm (not just the blood plasma) if they're hydrophobic?

I get that steroid hormones need hydrophilic plasma protein carriers (eg albumin, TBG) to travel in the plasma because they're not soluble in the plasma. However, I don't see any sources talking about how these hormones can then traverse through the…
Ally
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Prostaglandin F2-alpha production in men

I am trying to find information on Prostaglandin F2-alpha, specificaly production in men. Could somebody explain how this prostaglandin is produced? What types of cells are producing it, production signaling? Any books on this subject?
user2969
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Is Leptin Stimulated by Insulin Alone?

What is the mechanism of insulin stimulation in the human body? Is leptin release stimulated by circulating insulin directly? Which other factors are involved in the level of insulin release? My goal is to identify nutrients that aid/trigger leptin…
Tara
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How are steroid hormones secreted?

Peptide hormones for example tend to be secreted by Ca2+ mediated exocytosis following depolarisation and are secreted in vesicles. How are steroid hormones secreted and what stimulates their secretion? Please leave references if possible.
Thomas Collins
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What does it mean for a hormone to be "active"

In my textbook it is stated that the T3 hormone produced at the thyroid gland is 3-5 times more biologically active than T4. How is being active defined and how can this effect be measured?
Fraïssé
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Abnormal Prolactin Level

I want to know what makes the balance of the Prolactin abnormal. Is that related to the presence of a nodule near the pituitary?
Hanieh
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Are all endocrine glands associated with common human feelings?

I was looking at endocrine glands and found it interesting that a few of them have some very understandable feelings/mentalities associated with them. In particular: Gonads: arousal/romance Pancreas: hunger (glucose) Adrenal glands: fight or…
Seph Reed
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Aging and Hormone Levels

Hormone levels in humans decrease with age. The effects are especially detrimental for women after menopause. Biologists state that turtles do not exhibit most of the phenomena related to aging. For example telemore shortening does not happen in…
erkin
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What is the antagonist of epinephrine?

Norepinephrine and epinephrine have similar stimulant properties on the nervous system and the body. I was wondering which hormone is the antagonist of epinephrine?
Ayush
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Steroid Hormone Signalling

Can the lipid-soluble hormones (like steroid hormones) go inside every cell, as their particular receptors are located in the cytoplasm or nucleus of the target cells? Is there anything special on the membrane of the target cells which enables the…
biogirl
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How does the body make sure that Vasoactive Intestinal Protein reaches only the target tissue?

Vasoactive Intestinal Protein (VIP) is a 28 amino acid neuropeptide that has several effects in several systems. These include the cardiovascular system, respiratory systerm, urinary system, immune system, etc. Furthermore, some of the effects…
CoffeeIsLife
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Link between pornography abstinence and hormone levels

I have a question regarding abstinence from pornography, and also possibly celibacy, and how these two lifestyle choices affect hormone levels. Trends such as No Fap have been emerging recently. An excerpt from their website states : No Fap held…
Charlie
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What are the differences between Signaler and Primer pheromones?

I have searched few authentic books and have found the following difference between them. Signaler pheromone induces fast reaction in the recipient and the Primer induces slow reaction. But I did not find any book that discriminates their…
Tyto alba
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What is the effect of TSH on the calcitonin?

I know that TSH is released from the pituitary gland and it motivates the thyroid gland to release thyroxine, and calcitonin is released when the calcium level is high in the blood, but is calcitonin affected by TSH or not, I didn't find a specific…
Asmaa
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