Questions tagged [endocrinology]
The area of physiology dealing with the production and effects of hormones.
254
questions
-1
votes
0
answers
13
views
How were plant stress hormones discovered? [migrated]
My plant stopped growing in a specific direction after I pinched it there, and I've read it's because it released stress hormones that signaled it to do so. I was interested in how do we know this?
...
- 99
1
vote
0
answers
43
views
How does the female body sense its own pregnancy?
I understand that after the fertilized ovum attached in the uterus the female body will not produce the required hormone surge for ovulation the next month. Therefore no new ovum will be sent down the ...
- 111
4
votes
1
answer
71
views
How to reduce PPi concentration in blood samples by PPase
I have some samples of whole blood that are a little bit expensive and I want to significantly reduce the concentration of PPi in the samples by causing a reaction. I don't have any experience in ...
- 113
2
votes
0
answers
60
views
Cortisol in sharks
Is there an established method for measuring stress hormone levels, like cortisal, in sharks? If so, is it known what levels of such hormones create significant detrimental effects like decreased ...
- 259
0
votes
0
answers
51
views
What is the rate of conversion of testosterone to estrogen in men with Aromatase Excess Syndrome?
I read that men with Aromatase Excess Syndrome can produce large amounts of estrogen. I want to know if a man with this condition could produce more estrogen than a healthy young woman.
Some mock ...
- 109
0
votes
1
answer
46
views
Does hormone participate in metabolic activites?
strong text
My take on question-
All hormone are not water soluble, some are fat soluble also so this option is definiely wrong.
Thyroxine Hormone is do stored in the body in Follicle of thyroid ...
0
votes
0
answers
34
views
Peripheral androgen synthesis: How do I find where this occurs and limiting factors in tissues?
Please forgive me if the way I write this is stunted or awkward, I'm not a biologist :(
With around 25%-50% of women's androgenic activity rooted in active androgens synthesised directly in the cell, ...
- 101
1
vote
0
answers
42
views
What is the term for the physical and behavioral changes that occur in an adult species due to the change in their hierarchy?
For example, when a chicken becomes a rooster its crest becomes larger and their feathers become more colorful. Dominant male lions get larger and darker manes.
Also, can these changes also occur ...
- 19
3
votes
0
answers
152
views
Why does (insulin induced) hypoglycemia stimulate ADH secretion?
Intuitively, I understand that ADH (Anti Diuretic Hormone) is responsible for maintaining osmolarity, and increased serum osmolarity is a stimulatory factor for its release-- ADH increases water ...
- 944
1
vote
1
answer
38
views
Can oxytocin travel from one cell to another via gap junctions?
Oxytocin is a 9-residue secreted peptide. As a hormone, can it travel through gap junctions, assuming that it is stored in pre-synaptic neuronal vesicles?
0
votes
0
answers
30
views
Differentiating between hormones triggered on specific types of happiness?
Achievement:- Dopamine
Applause:- Seratonin
Discovering something new:-?
Remembering something after a long time/struggle:-?
Nostalgia:-?
Lust ;-Testosterone/Estrogen
Romantic Love:- Dopamine?
...
-1
votes
1
answer
53
views
Can caffeine act as viagra
Recently I studied that cAMP which is a 2° messenger can cause various physiolocal changes under the action of proper hormones. Now cAMP is degraded by phosphodiesterase and this ceases the actions. ...
- 839
1
vote
1
answer
44
views
Why hypothyroidism causes body ache?
In the condition of hypothyroidism the Thyroid Stimulating Hormone level is high in individuals. What signalling/metabolic pathway mediates this sensation of pain which is mostly experienced in feet ...
-4
votes
1
answer
38
views
Do hormones make it more likely to perceive sexual forms in otherwise non-sexual objects? [closed]
People can see sexual forms in many things. It seems that this varies with age, but this is not enough to claim it is because of sexual hormones. The question is: is it?
- 93
2
votes
1
answer
127
views
Is Pars intermedia functional in humans?
My textbook says, "Pars intermedia secretes only one hormone called melanocyte stimulating hormone (MSH)."
My teacher says that in humans MSH is secreted by the anterior lobe because the ...
2
votes
0
answers
18
views
Do circadian hormones fluctuations follow sleeping patterns or the time of day?
It is said that testosterone and cortisol are at their highest early in the morning, at 8 am, and lowest at night.
What happens, though, if someone regularly goes to sleep at 8 am and wakes up in the ...
- 121
1
vote
2
answers
98
views
Hormonal effects of Luteinizing hormone on endometrium
What is the effect of luteinizing hormone on the endometrium?
A general answer to this query is that it only thickens it. The same could also be said for the effect of Follicle stimulating hormone (...
- 11
4
votes
1
answer
110
views
Apparent paradox in Glucagon action
Glucagon stimulates glycogenolysis and gluconeogenesis, thus increasing the plasma glucose concentration — so that tissues get enough glucose in the fasting state.
However glucagon also inhibits ...
- 597
4
votes
1
answer
173
views
Why do beta-1 and beta-2 adrenergic receptors result in two completely different effects (though both use Gs pathway)?
$\beta_2$ adrenergic Receptors are $G_s$-coupled 7-TM proteins. Considering that $G_s$ , by activation increases $[\text{cAMP}]_\text{cytosol}$ which inhibits MLCK of smooth muscles (and causes ...
- 597
1
vote
1
answer
27
views
Why severely increased Ligand (eg Hormones) concentration downregulates the Receptor?
As an example continuous high blood level of GnRH in humans causes a suppression of LH and FSH. This is due to the fact that increased GnRH downregulates GnRH-Receptors . My question is how this is ...
- 597
-2
votes
1
answer
55
views
Glycogenolysis & Gluconeogenesis
Is glycogenolysis and Gluconeogenesis is the same in the terms of product formed?
This doubt arrived when I was attempting true & false and the question was
Glucocorticoids stimulate ...
7
votes
3
answers
581
views
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 ...
- 319
1
vote
1
answer
83
views
Why isn't there T2 thyroid hormone?
The follicles in the thyroid, intake iodine and bind them onto the tyrosine rings (attached to the thyroglobulin). This produces either MIT or DIT (tyrosine rings with 1 or 2 iodines attached ...
- 821
2
votes
1
answer
130
views
How does exercising/starved muscle import glucose (released by liver)?
Adrenaline releases glucose from the liver during sport or if starved. This glucose goes to the blood through GLUT2 transporter. But how does it get transported into the muscle cells? GLUT4 is the ...
- 606
0
votes
1
answer
103
views
Why is the thyroid gland in the neck?
The neck seems like an odd place for it. All other neck anatomy must interface between the head and abdomen (trachea, esophagus, circulation, spine etc).
Surprisingly I have not been able to find ...
- 155
2
votes
1
answer
94
views
What is the function of dreaming? Does a particular hormone secretion interfere with dreaming? Why do some people dream more?
I'm really interested to know when we are sleeping how a series of stories come to our mind that we called this process dreaming. If you know a useful article on this topic, please tell me thanks.
- 54
4
votes
2
answers
300
views
Why do patients with type 2 diabetes not show the body wasting seen in type 1 diabetics?
Type 1 diabetes results from the destruction of the cells in the pancreas that produce insulin, while type 2 diabetes is characterized by so-called "insulin resistance", presumably a reduced ...
- 179
0
votes
1
answer
40
views
Why would it be beneficial for cortisol and corticosterone to exhibit pronounced anti-inflammatory activity?
These questions are always a little silly (as we will never truly know), but it always struck me as odd that corticosterone and cortisol exhibit pronounced anti-inflammatory activity.
Because these ...
- 375
2
votes
1
answer
103
views
Why is angiotensin converting enzyme localized in the lungs
I understand that it's also found elsewhere, such as in renal capillaries, but I can't see logic behind it being located in the lungs. Isn't ACE's function, through making more angiotensin II, causing ...
- 293
1
vote
1
answer
192
views
Are hormones antigenic?
I have been asked whether hormones are antigenic.
I would have to think that the answer is no because they are used as various drugs such as FSH in infertility treatments without the need of ...
- 19
1
vote
1
answer
577
views
Differences between neurotransmitters and neuromodulators
According to the Wikipedia article on neuromodulation
a neuromodulator can be conceptualized as a neurotransmitter that is
not reabsorbed by the pre-synaptic neuron or broken down into a
...
1
vote
0
answers
25
views
Effect of angle of light on flowering of plants
I understand that the angle of light changes the direction of growth in plants (phototropism), but would the angle of light have any effect as such on the flowering of plants?
Thank you!
- 121
1
vote
1
answer
100
views
What are cells not affected by hormones called?
Cells that are affected by hormones are called target cells which have their own receptors that listen to signals. I'm unsure of the actual name of cells that are not affected by hormones, I tried ...
- 13
3
votes
1
answer
63
views
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 ...
- 207
-1
votes
1
answer
56
views
Why males are more prone to cardiovascular diseases such as heart attacks than females?
I often see more people of males undergoing treatment for heart disease. It is often said that female reproductive hormone (oestrogen) has some cardio-protective action by preventing constriction of ...
- 383
2
votes
2
answers
325
views
Are neurotransmitters part of the endocrine system?
I was speaking with a substitute teacher of mine, and we were discussing whether neurotransmitters are part of the endocrine system or not. My class just spent an entire semester on the topic of the ...
4
votes
1
answer
76
views
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
...
- 155
5
votes
1
answer
77
views
Can stress and arousal be independent?
I'm trying to figure out if it's possible to have a stress response without being initially, or simultaneously aroused. I'm defining stress to be physiological stress (ie. release of cortisol) and ...
1
vote
0
answers
40
views
Prolactin and Dopamine throughout orgasm?
Dopamine is also known as a prolactin-inhibiting hormone, which keeps prolactin levels in the body in check. However, during orgasm, dopamine is released to make the experience pleasurable. I know ...
- 331
1
vote
0
answers
37
views
What happens to eyelids when we feel sleepy?
Why is that whenever we feel sleepy, our eyelids start to feel heavier.
It is not like we can any time close our eyes and will immediately fall asleep. But, when we feel sleepy our eyelids ...
- 111
1
vote
1
answer
199
views
How are testosterone levels distributed among men and women?
Wikipedia tells me that men have 7 to 8 time higher levels of testosterone than women, on average.
Since the hormone is linked with performance in certain athletic events, my hypothesis, which I ...
2
votes
0
answers
62
views
Could certain drugs enable one to consistently eat above TDEE or BMR without fat gains?
I heard anabolic steroids and stuff like DNP and ephedrine and etc. can somewhat enable one to eat more and get away with it without much or any fat gain, despite eating more than the body would ...
- 29
2
votes
1
answer
1k
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 ...
- 510
0
votes
1
answer
182
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 ...
2
votes
2
answers
3k
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 ...
- 149
0
votes
1
answer
87
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?
- 15
2
votes
0
answers
412
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, ...
- 478
2
votes
1
answer
3k
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 ...
- 43
1
vote
0
answers
39
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 ...
- 111
4
votes
1
answer
106
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 ...
- 239