Questions tagged [physiology]

The study of the normal function of living organisms and their anatomical parts and the means by which their normal functioning is achieved.

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48 views

Does dreaming have any physiological impact on our body?

Personally speaking, when I wake up after a really good dream, I feel really happy, similar to how I would feel if something good has happened in reality. This makes me wonder if we are actually going ...
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111 views

Dopamine involvement in pleasure

There are some psychologists who believe that dopamine is not released during pleasurable activities but before them; my understanding is that a little dopamine is released pre-reward in order to ...
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134 views

Organism with the greatest amount of gold as percentage of body mass

I've read that the human body contains trace amounts of gold: http://www.tellmehowmuch.net/how-much-gold-is-found-in-the-human-body.html http://web2.airmail.net/uthman/elements_of_body.html Are ...
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What is the exact frequency of Delta brain waves during Slow Wave NREM Sleep?

I saw a TED talk about researchers playing pulsating pink noise while a test subject is in Stage 3 Non-REM / Slow Wave / Deep sleep and observing an increase in Delta wave EEG activity. This seems to ...
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Except for protecting ears from cold air, does a woollen cap provide any other significant advantage in winters? [closed]

I have woollen earmuffs and they are really comfy. They do the job of protecting ears well enough and I don't really have to worry about hair statics as they only cover ears and not my hairs. But many ...
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law of laplace and pressure developed in arteries

in arterioles the pressure depends on the impedance of the vessel(elasticity and youngs modulus) cardiac output pre arteriolar resistance what i want to ask is will the pressure also depend on law of ...
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How didn't large, highly active dinosaurs overheat?

The cube-square law seems to be the deciding factor when it comes to biological heat management. Small organisms with large surface areas relative to their volumes, like mice, need fast heartbeats and ...
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How do our sensory organs work automatically without our conscious effort? [closed]

I wonder how our different sensory organs (e.g., eyes, nose, ears, etc.) work automatically without our conscious efforts or without our command. We don't have to tell our eyes how to see, our ears ...
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Ipsilateral vs contralateral side of body

I know that the dorsal columns carry ipsilateral information. Is this fact relative to the dorsal column in question? If I want to talk about the right dorsal column, then the right side of the body ...
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1answer
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Why are there no fresh water osmoconformers?

I'm just having trouble understanding this. I know that often marine fish are osmoconformers, and freshwater (like bony fish) are often osmoregulators, but why?
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Ascending loop of Henle

When ions diffuse out passively or are actively transported out of the ascending loop of Henle, do those ions just hang around or do they go into the circulatory system and leave the kidney. I ask ...
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Is the Opah a warm blooded fish?

In 2015 many sources, including USA TODAY, Discover Magazine, and National Geographic, ran stories about the Opah fish (Lampris guttatus) being warm blooded. Image Source: http://discovermagazine.com/...
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why can't humans live underwater like seals or whales? [closed]

I was wondering, why can't humans live under water like whales or seals? If whales can live underwater, and they're mammals, why can't we?
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Why does a distraction cause a longer reaction time?

Does it have something to do do with the fact that the individual isn't concentrating on reacting to the stimulus, so it takes longer for it to be processed? How can this be out in terms of neurones ...
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Physiological Effect of Mannitol

Which Starling Force is affected by Mannitol? I am either thinking hydrostatic pressure of interstitial fluid (because it increases interstitial fluid volume) or hydrostatic pressure of capillary (...
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How are signalling pathways specific when secondary messengers are not?

I'm a biochemistry and physiology student and am aware that secondary messengers like cAMP and IP3 are used in specific signaling cascades. However, they and other molecules can innervate a variety of ...
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Why is liquefactive necrosis only seen in brain?

Liquefactive necrosis is a type of necrosis uniquely observed in brain. This occurs due to breakdown of cellular proteins by the action of hydrolytic enzymes. In other parts of the body, usually a ...
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1answer
329 views

Viability of argon-oxygen atmosphere

Can humans breathe an Argon-Oxygen atmosphere, where Argon substitutes the inert Nitrogen gas which currently populates our atmosphere? I didn't quite know which forum to stick this one in; I put it ...
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What is the function of the Hyoepiglottic ligament?

The hyoepiglottic ligament (ligamentum hyoepiglotticum) is an elastic band that connects the epiglottis to the hyoid bone. Although I can find information about the clinical significance of this ...
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Is there enough vitamin B12 in lakes, rivers and ponds, for humans not to need to take supplements?

Vegans will often say that having an animal-free diet is best for our health and is actually the diet that humans should be eating to function optimally. To which meat eaters will raise the issue of ...
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Alpha-gamma co-activation

I am having trouble visualizing/grasping the necessity of alpha-gamma co-activation. My understanding is the following: When an external load causes stretching of the sensory muscle spindles, the 1a ...
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1answer
33 views

AntiTrypsin Enzyme [closed]

In a smoking patient, is the lung over digested because of a combination of smoking and a defect in the antitrypsin gene (prevents digestion from protease)? Or does smoking act the same as a patient ...
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205 views

Why there is no typical cells

My physiology book says that cell specialization is so great that no cell in the body could be called a typical cell. I don't understand the above sentence, why couldn't there be typical cells? After ...
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409 views

Could humans breathe if the average methane content of the atmosphere increased to 1%?

Below is a table of atmospheric composition. Could humans breathe if the average methane content of the atmosphere increased to 1%? Table 7a-1: Current Average composition of the atmosphere up to ...
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953 views

Why does the amount of adipose tissue contribute the most to the total body water amount in humans?

I don't quite get this concept. An obese individual will have a greater fat content in their body, and thus will have 45% water in their bodies (for example), versus a slim person that will have 75% ...
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Do blood vessels expand during angiogenesis?

I know that there are two usual ways of creating new blood vessels: A new vessel sprouts from the wall of an old one, A wall of cells grows down the middle of a vessel, splitting it into two. I also ...
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77 views

Why aren't the brains of most advanced life forms in the middle of their bodies? [closed]

This question is designed to be the successor to Why don't most animals have "heads" in the middle of their bodies? The previous question was flawed as it fails to accurately define ...
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Can you "fight" a coma or serious illness?

In an article about the latest earthquake to strike Mexico, I read that a rescuer said to someone in a gurney, "Fight for your life, please!" I've seen similar things in TV shows and movies where a ...
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412 views

What is the most primitive organism that can die of aging? [duplicate]

I know that simple organisms containing of just few cells have no mechanism of dying because of aging. I guess, they typically die due to being out of food or due to becoming someone else's food. ...
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265 views

Determining water movement in Cells with Same DPD

A cell has OP=10bars and TP =5bars .other cell has OP =15 bars and TP =10bars. DPD of both is same ie.5bars. So how do we determine in which direction water will move? OP is osmotic pressure. TP is ...
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314 views

The onset of hair loss in men

I've seen men starting to lose hair in almost all ages. Why is the onset of hair loss in men different? Is there a normal distribution?
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Are there predefined implantation sites in mammalian uterus?

I do surgical embryo transfer of genetically modified (microinjected) mouse embryos (at 1 or 2 cell stage). As most of the constructs are new, we expect that it may affect birth rate. In case there ...
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Why does a worm's skin need to be wet for oxygen to diffuse across it?

Pages I've read about worms' respiratory systems says that the skin needs to be wet (covered in mucus) or oxygen won't diffuse across the skin. Why? If there is more oxygen outside the worm's skin ...
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Glycolytic non-oxidative pathway

I am currently digging in some books to understand the three major metabolic pathways involved in physical training. The most difficult one for me is the glycolytic non-oxidative pathway (also more ...
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Why do earthworms surface after a rain?

Googling, I find two different explanations for why earthworms tend to surface after a rain. This page from UCSB, for example, gives both answers, contradicting itself: The first explanation is ...
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What is the biggest structure in nature for structural coloration?

I'm interested in the actual sizes behind structural coloration: I find it fascinating and I think it may have a couple very nice applications. The problem is I couldn't find anything but vague ...
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Why repolarization in ventricles start in last area which is depolarized "epicardium " rather than first area "endocardium" [closed]

About ventricular repolarization , l know it start in the last area which is depolarized ( that is why it has positive deflection on ECG ) but the question is why it start in that area ( epicardium ) ...
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Why doesn't ovulation occur in both ovaries simultaneously?

I know that in human body ovulation takes place at only 1 ovary every month. But development of a follicle depends on FSH levels in the blood, and since both the ovaries are exposed to the same blood ...
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203 views

Is a one ventricle heart feasible?

So this is derived from a lesson at Khan Academy. The mind activity assumes that the one ventricle heart pumps blood to the lungs for oxygenation then rest of the body. However, the problem is that ...
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Why are (most) right hand dominant people also right foot dominant? And the same for left handed/footed people

Just as the title states -- Why do people who are right hand dominant also tend to be right foot dominant? And, the same question for left handed/footed people. Does the brain actually designate an ...
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319 views

Affinity for oxygen and carbon dioxide in animals

I'm currently reading Treatise on Invertebrate Paleontology (A) and don't understand the following fragment: The affinity for oxygen in lower animals is many times that in higher ones, whereas ...
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Is it correct to use the terms multinucleate and syncitia interchangeably?

If you see the skeletal muscle,it is having several nuclei and is said to be "multinucleate".Similarly the cardiac muscle is also having several nuclei yet it is specifically termed"...
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Rationale behind different classification of nerve fibres

Two main types of classification of nerve fibres are numerical and Erlanger-Gasser classification, based on diameter and conduction properties. In numerical classification group Ia and Ib both have ...
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What happens to deep sea creatures if they reach the surface?

Since deep sea creatures are adapted to incredibly high pressures, I would assume they would not be able to survive in the low pressure environment of the surface. What exactly happens ...
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1answer
119 views

Is it hydrogen atoms or electrons that are passed along an electron transport chain?

I am so confused because my book says it is electrons which are passed along the electron transport chain but all we are considering is hydrogen ions (H+) and hydride ions (H-). Can someone clear that ...
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2k views

Bicarbonate concentration in saliva

From the picture it can be seen that Bicarbonate is secreted into lumen of duct of salivary glands by exchanging Cl- ions. So if flow rate of saliva is increased then its obvious that less Cl- is ...
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Feffects of frequent & sudden variation in room/surrounding tempratues [closed]

If out door temprature is like 40°c with 100% humidity and indoors temperature is around 35°c. Whereas an air conditioned room in the house has a temperature maintained at 20°c with very less ...
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Microalbuminuria in inflammation of urinary tract

Albumin is excreted into urine (albuminuria) in nephrotic syndrome and in certain inflammatory conditions of urinary tract.$^1$ How is inflammation in urinary tract related to increase in albumin ...
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Why nerve fibre is infatiguable?( is my conjecture correct?)

According to this: A nerve fibre cannot be fatigued, even if it is stimulated for a long time. This property of infatiguability is due to absolute refractory period. How is refractory period ...
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936 views

Pressure change in atria

Background:It is said that during the phase of isovolumetric contraction , due to sharp rise in the ventricular pressure, there occurs bulging of AV valves into the atria producing a small but sharp ...

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