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Questions tagged [endocrinology]

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

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1answer
29 views

What's the difference between releasing hormones and tropic hormones?

I've been reading my textbook and two terms have appeared that, after a bit of looking, I still can't seem to be able to distinguish. Here's what the textbook says (McGraw Hill Bio 12, 2011): After ...
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1answer
64 views

Is there any way bicondylar/bigonial, bizygomatic or bitemporal breadth can change in adults?

Without cosmetic surgery or etc., are there any cases/example wherein a human adult has had a change in significance regarding these regions of the face? I have seen many anecdotes where people have ...
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1answer
397 views

What's the difference between the neuroendocrine system vs endocrine system?

This is what I have understood so far: Neuroendocrine system involved neuroendocrine cells (also known as neurosecretory cells) that receive nerve impulses by a sensory neuron to release ...
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1answer
23 views

Hormones - biotic or abiotic

Are hormones biotic or abiotic? I have tried reading different articles, and I've found that it is both, but can that be true?
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0answers
192 views

Why is erythropoietin produced in the kidney?

Erythropoietin is a hormone produced in the kidney to stimulate the generation of more red blood cell. It is triggered by low oxygen via HIF transcription factors. Makes sense. Oops, oxygen is low, ...
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1answer
225 views

What is the difference between a cytokine, a hormone and a protein hormone?

I'm trying to figure out the difference between hormone, cytokine and protein hormone. It's clear to me that all three are biological messengers, but there seems to some ambiguity and overlap between ...
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0answers
22 views

Delay of sleeping on cortisol cycle

I was told that cortisol has to be measured at 9am or 4pm, because those where its peak level. But I wonder if changes on sleep patters affect the cortisol cycle. I mean, if I usually go to sleep ...
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1answer
82 views

Why are the hormones dopamine, adrenaline, noradrenaline and serotonin so ubiquitous across the animal kingdom?

As far as I know there is no reason for the makeup of a given hormone to be universal as it merely serves as a carrier from one part of the brain to another. So why are the above hormones seen across ...
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1answer
246 views

Is vitamin D a vitamin or a hormone?

Some people like to say that vitamin D is a hormone. A simple set of differences between hormones and vitamins is described here. Vitamin D is not (for the most part) absorbed through food but ...
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12 views

Why the same complex compounds occur and play different roles in different organisms?

For instance, in humans estrogens function as sexual hormones, but they also occur in many plants, where obviously their role is totally different. Some compounds, such as psilocybin have psycho-...
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1answer
107 views

Can men also become only bald on their legs?

Often hair loss that primarily affects the top and front of the scalp will happen to men (and female) during aging. Male pattern hair loss is believed to be due to a combination of genetics and the ...
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1answer
64 views

Does estrogen increase muscular growth in females?

Regarding humans it is said that most psychological effects caused in men by testosterone are caused in women by estrogens. There are many studies on that, particularly regarding temporary shifts of ...
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22 views

Positive/ negative feedback of oestrogen

In the menstrual cycle at around day 12-14, oestrogen undergoes positive feedback which leads to ovulation and high concentrations of LH and FSH. But during other times in the cycle, oestrogen is ...
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1answer
130 views

Hormonal terms Somatotrophin or somatotropin?

Are Somatotropin and Somatotrophin hormones the same? It's confusing because when you type in Somatotrophin in google, it says, "a growth hormone secreted by the anterior pituitary gland.", but there'...
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1answer
139 views

How is the urea cycle regulated with respect to protein deficit?

Proteins cannot be stored in the body. Excess proteins from the diet are deaminated in the urea cycle that takes place in the liver. The liver is the first contact since these amino acids are ...
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1answer
270 views

What allows the hypothalamus to detect a lack of thyroid hormones?

On the website www.yourhormones.com it is written: "If there is insufficient thyroid hormone available for the brain, this will be detected by the hypothalamus and thyrotropin-releasing hormone ...
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1answer
56 views

Are releasing-hormones and release-inhibiting hormones from the hypothalamus ever present in the blood?

Our teacher said that these two hormones are normally never present in the blood stream, and to be carfeul of it if it comes as a question. I'm not conviced to be honest, is this true?
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109 views

Do ovaries produce estrogen before menarche?

It is traditionally taught that estrogen is produced by the granulosa cells of the follicle. But before menarche, where does the estrogen come from? Is it from the thin layer of granulosa cells lining ...
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2answers
6k views

difference between neurotransmitters and hormones

I have been reading a lot about neurotransmitters and hormones but what's the difference between them both or are they the same? It's been confusing for a while now. Also, why do some ...
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2answers
120 views

Are all of our hormones synthesized in the same gland that they are secreted from?

For example, growth hormone is secreted from the anterior pituitary; is it also synthesized there?
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0answers
15 views

What is the concentration/molecules per cell of iodothyronine deiodinase in a cell?

I'm trying to parameterize an in silico model and need the approximate concentration (M), or molecules per cell, of iodothyronine deiodinase type II (D2) enzyme in a human cell, ideally a glial cell. ...
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0answers
34 views

How are neuromodulator receptors distributed?

Irrespective of where, when and how neuromodulators are released, eventually they are detected by some receptors in the membrane of a target neuron (typically G protein–coupled receptors) ...
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1answer
3k views

Does donating blood lower testosterone levels? [closed]

I'm a guy and I decided to donate blood because of persuasion. My testicles feel weak afterwards specifically. I mean they feel like they're compensating -- assuming that makes sense. Is this because ...
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347 views

What causes weight loss and fatigue in Addison's disease?

Why would a lack of cortisol cause fatigue? In terms of normal functioning of the gland.
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2answers
630 views

What is the difference between neurotransmitters acting as neurotransmitters and hormones?

My main confusion is what differentiates the action of a transmitter substance as a neurotransmitter and as a hormone. For example, when norepinephrine is being talked about as transmitter substance ...
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0answers
37 views

What causes puberty to begin? [closed]

I understand that puberty begins when hormones are released from the pituitary gland as instructed by the hypothalamus, but why does the hypothalamus instruct this to occur? How is this process timed ...
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1answer
24 views

can dissolving be endothermic process [closed]

can dissolving be endothermic process. I have a container with glucose(solid state) and added water and found the container getting colder. was wondering there is no reaction(just a physical process) ...
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1answer
1k views

Is there a biological urge to have children in women?

Searching information about this subject often leads to personal stories from women making the choice to live childfree and women stating they either always wanted to have children or experienced a ...
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0answers
96 views

Role of auxin and cytokinins in vascular cambium or callus formation

Usually, auxins promote cell growth and cytokinins promote cell division. But, I got an information from my teacher that, in case of vascular cambium or callus formation, auxins promote cell division ...
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1answer
112 views

Testosterone level in body with activites

Does ejaculation lower level of testosterone in body, Conflicting reports on internet, a firm answer would help a lot?
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0answers
194 views

Does testosterone weaken the immune system?

I was reading this articles here that states that the higher the blood level of testosterone is, the weaker the immune system gets. I read another article about testosterone here that focuses on the ...
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0answers
121 views

Exocrine system + endocrine system =?

What is the title name for endocrine system + exocrine system? In another language that I speak they are called "secretion system" but in English the term secretion system is different and it is ...
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0answers
45 views

Gland defined based on morphology or hormone secretion?

Is a gland defined by a visible morphology, or is anything that secretes a hormone a gland? The answer does matter for the definition of histamine. Based on the answer I can conclude whether it's an ...
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1answer
115 views

How are commercial steroid hormones produced? [closed]

Does someone know how oestrogens and androgens used for treatment are made? Is it with a GMO bacteria? Is it chemistry? Thanks
7
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1answer
138 views

What is this small tissue structure found in kidney?

It's covered with white adipose tissue and it is smooth with reddish brown colour. HE dyed with dimensions 3 cm long and 1 cm wide. I'm guessing that this is a rare thing because I already checked ...
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1answer
309 views

What will happen if there is high concentration of both calcitonin and PTH in blood?

What will happen if there were a high concentration of both calcitonin and PTH (parathyroid hormone) in the blood? In that case, will calcium resorption from bone occur, or absorption from intestine, ...
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0answers
73 views

What is the current consensus on the Loveheim Cube of Emotion [closed]

I recently encountered the Lovheim Cube of Emotion. I was wondering what level of supporting research there is to go with it and whether or not there is a concensus at this stage. If I'm perfectly ...
3
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1answer
735 views

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 ...
3
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1answer
32 views

Why is secretin sensitive to acid?

My textbook says, secretin secretion is triggered by the presence of acidic chyme in intestine. But why is secretin sensitive to acidic environment? I checked the wikipedia page of secretin and found ...
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0answers
51 views

Why do palpitations happen when someone is nearing something rewarding? [closed]

When you are nearing something rewarding (IE: winning a prize, or winning a game), why do you experience tachycardia? For example, if someone entered a raffle with the number 9284938, and the ...
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1answer
173 views

Attraction and hormones levels

Why do we ignore all imperfections in people we fall in love with for a couple of months, but after a certain period we start noticing imperfections? Can hormones - or any chemical - be used to ...
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0answers
494 views

What is the function of oxyphilic cells in the parathyroid?

Apart from the chief cells, which produce and secrete parathyroid hormone (PTH), the parathyroid gland has another type of cells, which are large and fewer in number, have small, dark nuclei and an ...
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0answers
121 views

What happens to apetite hormones like ghrelin and leptin when a person in coma?

Don't coma individuals feel hungry? If so, how does the brain senses this condition (as coma is caused by neural death or damage) and switches off gene expression of ghrelin and leptin. Is there any ...
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1answer
56 views

Are hormone secretion variations the same for a pair of monozygotic twins?

I have recently read a paper about how stress affects morning salivary cortisol levels in an individual. I am conducting a study on monozygotic twins and was wondering if cortisol levels would ...
3
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1answer
1k views

Do all organs of our body secrete hormones?

My teacher says that all organs of our body secrete some kind of hormone so they are all glands. Is the statement entirely correct without any exceptions? Till date I am unable to find any exception ...
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1answer
899 views

What is meant by “catalytic amount of a hormone”?

This textbook says: In the classic definition, hormones are secretory products of the ductless glands, which are released in catalytic amounts into the blood stream and transported to specific ...
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1answer
3k views

what is the difference between pituitary dwarfism and thyroid dwarfism? [closed]

My book (Comprehensive Biology class XI, by J P Sharma ) mentions of two kinds of dwarfism- "Pituitary Dwarfism" and "Thyroid Dwarfism" but does not provide any details about the matter. so please ...
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3answers
3k views

Why is insulin given in type 2 diabetes?

For this reason "insulin insensitivity", or a decrease in insulin receptor signaling, leads to diabetes mellitus type 2 – the cells are unable to take up glucose, and the result is hyperglycemia (an ...
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521 views

Alan Turing was treated with estrogen-analog, though he was gay. Shouldn't it actually increase his female-like desires?

Alan Turing was a great mathematical genius of all the time, as well was a homosexual-male. However, the biography of Alan Turing on Wikipedia ( Permalink ) tells that : Turing was convicted and ...
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1answer
546 views

Function of testosterone in women and estrogen in men

I was recently surprised to find out that testosterone and estrogen are found in both men and women albeit in different amounts. I know that testosterone is related to the development of facial, body ...