Questions tagged [physiology]
The study of the normal function of living organisms and the means by which it is achieved.
0
votes
0answers
17 views
How to troubleshoot in vitro formaldehyde fixation for nucleosomes?
For an experiment, I am trying to fix the mononucleosomes (100ng) using formaldehyde as crosslinking agent in HEPES buffer. I have been using 2% formaldehyde in a reaction buffer containing 1mM EDTA, ...
0
votes
1answer
19 views
Does the frequency discrimination of the outer hair cells of the ear increase with sound pressure?
I'm wondering whether the frequency resolution of the inner ear increases/decreases with the volume level (caused by sound pressure $(N/m^2)$.
My assumption would be that as long as the pressure ...
2
votes
1answer
73 views
How does a nerve cell adjust if O2 diffusion is interrupted?
What effects would it have on a nerve if the oxygen supply is cut off? Is there any data on this?
Does the nerve conductance velocity increase? What about the Amplitude and receptor-channels on/in ...
2
votes
0answers
41 views
Why does K+ going out of the cell cause hyperpolarization?
I'm really confused by how the terms Hyperpolarization and Depolarization are used in Cell biology and hope somebody can enlighten me hopefully.
Here's what they mean for me so far:
Depolarization ...
3
votes
0answers
40 views
How does isometric contraction work?
What exactly happens to myosin during isometric contraction? I suspect that either myosin heads just "freeze" in the middle of crossbridge cycle, or go through full crossbridge cycles repeatedly at ...
1
vote
1answer
62 views
Why didn't these scientists restore electrical activity in this pig's brain?
This experiment was published in Nature Magazine: Pig brains kept alive outside body for hours after death. The researchers used a system called BrainEx to revive certain metabolic and physiological ...
1
vote
1answer
63 views
Why does histamine cause bronchoconstriction?
What purpose does histamine-caused constriction serve in lungs during allergies and such, since it's vasodilator in other parts of body. Wouldn't it be more practical to vasodilate lungs so that white ...
2
votes
1answer
51 views
Why does muscle blood flow decrease during exercise?
My questions semi-relates to these two items: Where does extra blood come from to fill your muscles during exercise? , and Blood pressure during exercise .
While reading Exercise Physiology by Dr. ...
0
votes
1answer
71 views
Coronary circulation
It is said that the coronary artery that gives the posterior descending artery(PDA) determines if the heart is right dominant(most cases) or left dominant. Is there any reason to this? Why PDA?
0
votes
1answer
62 views
Is it correct that the nicotinic acetylcholine receptor has nothing to do with Dopamin?
As I know Dopamine is almost exclusively produced via metabotropic receptors, is it possible for a nicotinic ACH receptor to influence a dopamineric neuron?
Can a nicotinic ACH receptor cause a ...
2
votes
0answers
113 views
Living potato clock? [duplicate]
Could a potato stay alive and power a clock while growing in the ground?
I know how a potato clock works as a electrochemical cell and involves chemistry, but I am only interested in a growing ...
0
votes
0answers
14 views
Is it possible for a human being to live on a different day cycle?
I am considering writing a story where a character lives on a 30-hour day cycle.
That is, this person sleeps for 9.5 hours and is awake for 20.5 hours. Then this person repeats the schedule.
I'd ...
1
vote
0answers
14 views
In oscillometric blood pressure measurement, why do we assume that highest oscillations correspond with mean arterial pressure?
As far as I've seen, the point on the oscillometric curve where there are greatest oscillations represents the mean arterial pressure (MAP).
My question is - why? What is the logic behind this ...
4
votes
4answers
145 views
What's the benefit of the average human body temperature?
Why would the body choose a resting temperature of 36.1c to 37.2c? It seems a very inefficient mechanism of survival considering the typical ambient temperatures on Earth. If there is a benefit to ...
0
votes
0answers
16 views
What is the net effect of pancreatic somatostatin and how is it regulated?
I've read the following facts about pancreatic somatostatin released from delta cells of the islets of Langerhans:
Blood glucose, fatty acids, and plasma amino acids stimulate somatostatin
...
0
votes
0answers
7 views
What's the significance of independent control of glomerular capillary pressure and plasma flow, via efferent arteriole?
As I understand, the renal efferent arteriole, when constricted, allows an increase in glomerular capillary pressure, but a decrease in blood flow. This allows an independent control of renal plasma ...
4
votes
0answers
27 views
Are there specific theories as to what causes cold[-water] muscle cramps?
The field of what might cause cramps is quite contested with a lot of controversy around the heat/dehydration cramps, but I find it surprising that no specific theories appear to have been proposed (...
4
votes
1answer
218 views
Why is the ingestion of salt and water beneficial to muscle cramp
According to Wikipedia, muscle cramps are caused by the inability of myosin fibers to break free from the actin filaments during contraction, resulting in a prolonged contraction.
A lack of ATP would ...
6
votes
2answers
139 views
Why do fruit flies go so close to large reservoirs of liquid when they are likely to fall in due to surface tension?
I had accidentally left out half a glass of red wine by the windowsill when I went to sleep. As anyone knows, if you do this with a window cracked you will get quite a few fruit flies near it in that ...
1
vote
0answers
95 views
How can we smell odor direction if we breathe through one nostril at a time?
It's known that humans breathe mostly through one nostril at a time. How can we then perceive the direction the smell is coming from? Some articles claim similarity between olfactory and auditory ...
8
votes
1answer
83 views
Do animals with their eyes ~180 degrees apart have depth perception?
Lots of animals have their eyes more on the side of their head, like an octopus or a parrot. Are animals with eyes more on the side able to tell the depth of objects at different distances? It seems ...
0
votes
0answers
11 views
Is creb level linked to cancer
I am just wondering if there is any evidence the overall proteome CREB transcript level is linked to cancer. Most likely since it is so Central to the underlying pH driven process.
4
votes
2answers
128 views
Why does the seed of the coconut tree have a liquid in it?
What is the purpose of water in the coconut seed? The reason I ask this is that I was reading about coconut water and all the benefits it has for us Humans. But why does the tree put a liquid in the ...
2
votes
1answer
31 views
Effect of the same caloric intake of different macronutrients on body weight
To gain weight, caloric intake > caloric expenditure.
To lose weight, caloric intake < caloric expenditure.
But what is the effect of the type of macronutrient ?
That is to say :
does the same ...
1
vote
3answers
153 views
Why do our bodies maintain blood pressure but not the flow rate?
This might be a silly question but i'm not not clear
I'm always told that blood pressure is homeostatic parameter and can't not be changed but isn't what important is the flow rate to the organs? ...
0
votes
1answer
34 views
Why does carbon dioxide diffuse easier through the bilipid layer than oxygen?
When gas exchange occurs during respiration, the pressure of oxygen in alveoli is around 105 mmHg, whereas in the blood vessels in close contact with alveoli is 40 mmHg. For carbon dioxide the values ...
2
votes
1answer
43 views
How does a decrease in free Ca2+ result in nerve/muscle overexcitability?
I have in my notes that a decrease in free Ca2+ increases membrane permeability to Na+ so that it is brought closer to threshold, but no further details. So how does this work?
-1
votes
1answer
176 views
Why does the peak magnitude of the cardiac pacemaker action potential not increase to levels closer to the Ca++ equilibrium potential? [closed]
it does for K+ and Na+ but not calcium? why?
0
votes
0answers
16 views
Muscular tetany and hypocalacemia
Decreased serum calcium level leads to increased excitability of neuron and at same time decreases the contractibilityof the muscle fibres.But still its causing tetany.Wouldn't these two counteract to ...
11
votes
3answers
199 views
Why did a lot of common insects evolve such a thin waist?
Something that doesn't quite make sense to me is why lots of insects like ants, bees and wasps have a such a small petiole when it connects many major organs to the rest of their body from a suddenly ...
1
vote
0answers
34 views
Why is the V/Q Ratio 0.8 not 1?
According to: https://en.wikipedia.org/wiki/Ventilation/perfusion_ratio the ideal V/Q Ratio would be 1.0 because 1 L of blood can hold about 200 mL of oxygen and 1L of humidified air has about 200 mL ...
0
votes
1answer
89 views
What is the difference between optokinetic and vestibular nystagmus?
Optokinetic nystagmus is for stabilising the pictures we see when we are observing moving objects for example if we are rotating on an office chair. If we wear a mask while rotating however, the ...
3
votes
1answer
292 views
Why does sympathetic activity constrict pulmonary vessels?
I don't know understand why sympathetic stimulation constricts pulmonary vessels?
I thought that the sympathetic nervous system activated the body for physical activity. Physical activity would need ...
2
votes
1answer
21 views
Does focusing on a certain part of the body increase electrical activity in that region?
I am batting around ideas for master's thesis topics and was wondering whether or not just focusing on an area of the body would cause of boost of neuronic activity? Not sure whether this would fall ...
1
vote
1answer
62 views
Blood pressure in various blood vessels and heart
What are the typical systolic and diastolic blood pressure in arteries,capillaries, veins and the heart?
I know it must be highest in the arteries. arteries>capillaries>veins
Arteries: 120-80mmHg (...
3
votes
2answers
541 views
What causes “ear rumbling”?
The video Ear rumbling happens below the range of human hearing demonstrates that the "ear rumbling" sound is actual sound and can be recorded by a sensitive microphone near the ear.
What is it ...
0
votes
1answer
41 views
How does vasoconstriction increase the pressure of blood?
Is the increase of pressure due to the decrease in volume? Wouldn't the decrease in volume push the components of blood closer to one another resulting in an increase of repulsive forces, thus ...
0
votes
0answers
27 views
What is the optimal time to implant embryo in uterus for in vitro fertilization?
What is the best time to implant an embryo in the uterus. I was under the impression that the earlier the better and more natural, but also if you wait until the blastocyst age, it may be better to ...
1
vote
0answers
17 views
How do booklice avoid dessication?
I often find booklice (aka psocids) in old paper notes I have in semi-storage. These pages of paper are intentionally left in dry conditions on my desk to avoid damage. However, if the psocids live ...
2
votes
0answers
66 views
Why does water stress lead to alkalinity of xylem sap in plants?
I was reading this book: Plant Physiology and Development, Sixth Edition by Lincoln Taiz, Eduardo Zeiger, Ian M. Møller, and Angus Murphy when this doubt came to my mind. Abscisic acid, the stress ...
0
votes
0answers
18 views
Etymology of eccentric/concentric contractions
I was wondering if anyone knew why the terms eccentric and concentric were chosen to refer to lengthening and shortening muscle contractions?
The basic etymology of the words are to do with ...
1
vote
1answer
46 views
When muscles contract is the process similar to how non-newtonian fluids react?
I'm trying to understand how muscles contraction/tension works but getting loss in on the cellular level. From my understanding, when muscle tissue need to contract, the cells are flooded with calcium?...
2
votes
2answers
726 views
Wim Hof Method claims Alkaline Blood is Good. Contradictions? Counterproof?
The Wim Hof Method claims, that it is beneficial to have alkaline blood.
On the other site there is the medical claim that if the pH-value is not within the
range of 7.36 – 7.42, enzyms are ...
1
vote
0answers
31 views
When we laugh or run for sport which autonomic system works?
When we laugh or run for sport which autonomic system takes place in this time?
While I am not sure what happens in heart while laughing (tachycardia or bradycardia), but for sport running I'm sure ...
0
votes
1answer
114 views
Continuous (yeast) culture system satisfying multiple criteria
There are multiple ways yeast cells can be grown in liquid cultures.
Batch cultures are easy to prepare but cell density, medium composition and physiology change over time
Chemostats allow to ...
18
votes
3answers
1k views
Public database of animal specifications
I'm a math teacher looking for data to help my students interested in biology complete a quantitatively flavored study of animals. (As a math person, I apologize if I'm not using discipline-...
2
votes
1answer
63 views
Is there a name for the use of sunlight in metabolic processes?
"Photosynthesis" is what is used to describe how plants use sunlight to synthesize sugars, but, I also heard some animals like humans use sunlight in the process of creating vitamin D. Is there a ...
5
votes
1answer
126 views
Do sharks fart?
My son is 5 and I'm encouraging him to be curious and ask questions of the world around him.
He asked if sharks fart and how does it smell? He feels that it would smell of fish and be disgusting.
He ...
1
vote
0answers
57 views
Why is the glomerular filtrate isotonic to the blood in the capillaries?
How can the osmolarity of the filtrate be the same as the blood in the peritubular capillary when there is no red blood cells filtered?
4
votes
1answer
190 views
What are the limiting factors of human stamina?
What are the limiting factors of (human) stamina? Let's define stamina as the capacity to continue doing a physical activity. We clearly have our limits, so what aspects of physiology impose a limit ...
