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147 votes

Why do I only breathe out of one nostril?

This is a natural phenomenon called the nasal cycle. It is discussed in this paper by Telles et al. (1994), among many others. The nostrils are used on an alternating cycle of about 2-3 hours, ...
39 votes

Why do I only breathe out of one nostril?

As others have said, this phenomena is called the nasal cycle, a process controlled by the autonomic nervous system that alternants congestion between your nostrils. Mentalfloss of all places has an ...
  • 521
4 votes
Accepted

Cartilage regeneration

The reason that cartilage rarely is able to regenerate is that it is poorly vascularized and innervated. It doesn't have its own blood supply to deliver signaling molecules that promote regeneration ...
  • 1,309
4 votes

Does our nose detect only if there is change in odor?

Senses in general adapt to continuous stimulation due to various processes. One such process is simply the exhaustion of the reserves of a receptor, or secondary neuron, due to a depletion of ...
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4 votes
Accepted

When you blow through your nose while holding it closed to "depop" you ears, why do you sometimes feel it in your eyes?

The sinuses connect the ear, nose and throat as well as the tear ducts of the eye. The pressure created when holding your nose and blowing is transferred to any area it can get to; in this case, the ...
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3 votes
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What are the reasons that soap has so different smell and flavour?

It is possible for a substance to not smell very much, but to taste very strongly - chili peppers are a great example. They (in my experience) have a rather weak spicy odor, but the taste is much much ...
  • 15.1k
3 votes

Evolutionary advantages of wet nose of cats and dogs?

Why did it evolve ? Mammals with rhinaria tend to have more acute olfaction, and the loss of the rhinarium in the haplorrhine primates is related to their decreased reliance on olfaction, being ...
  • 2,278
3 votes
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Are we deaf to water's taste/smell?

It appears that little is known regarding how water is detected in mammalian mouth and throat. However, a recent study published in Nature Neuroscience(1) showed that acid-sensing taste receptor cells ...
  • 677
2 votes
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Why is it unlikely that bathroom smells can pose health risks?

Mostly, what you're smelling are volatile small molecules: stuff like butyrate, indole, mercaptans, hydrogen sulfide, etc. These molecules are thousands of times smaller than even the smallest ...
2 votes

Why does menthol clear a stuffy nose?

Menthol is stimulating action potential at cells which are inducing thermoception. As far as I have found out it does not have any effect beyond that. The patients only feel like they can breath ...
1 vote

Do the nasal cilia move the particles trapped in the mucus out of the nose or down the throat?

The movement is towards the pharynx (to be then swallowed). It's useful, in the case of respiratory cilia, not to think of it as 'up' and 'down,' but rather as 'toward the pharynx.' In the lungs and ...
1 vote

Is it possible for human beings to feed through the nose?

Certain vitamins, for example, vitamin B12, can be absorbed through the nasal mucosa by simple diffusion. Many nutrients can be absorbed through the intestinal mucosa only by the help of specific ...
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1 vote

Viral susceptiility of Nose and eyes

Between the eyes and nose, which offers better immune protection Neither. Both are mucous membranes lined by epithelial cells. Each is their own niche (and the nose has a number of sub-niches), with ...
  • 8,721
1 vote

Are nosebleeds unique to humans?

Nose bleeding (or epistaxis, as Graham rightly termed it) is common to many species, such as dogs, cats, pigs, and many other animals. As for the causes, like Graham pointed out, it really varies ...
  • 2,721
1 vote

Are nosebleeds unique to humans?

Cats, dogs and other animals can suffer from epistaxis. The causes differ depending on the animal. foreign things in the nose, abscess, cancerous growth, snake bite, some poisonings and diseases ...
1 vote
Accepted

Why are nosebleeds easier to get in the winter?

The vast majority of bloody noses in healthy individuals arise from one specific area in the nose (on either side): Kiesselbach's plexus. In the mucosa of the nasal septum (the cartilagenous ...
1 vote

Do pet animals and humans perceive good and bad smells differently

TL; DR Mostly no. On a molecular basis, cats' and dogs' noses look quite similar to ours. Most of what we know about smell comes from studies on non-human mammals, and is supposed to apply to humans ...
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1 vote
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Is saturation of olfactory cells able to create a feeling of another odour when it stops?

The problem with odors is that no known odorant hits only one olfactory receptor. A saturating concentration of compound X for receptor A might be saturating another receptor B, but not receptor C. If ...
  • 695
1 vote
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Are there electron or proton receptors in our nose?

Chloride (Cl2) carries 34 protons and electrons. A common example of a relatively heavy odorless gas is CO2, carrying 22 protons and electrons. All noble gases are odorless. The heaviest, ...
  • 51.6k
1 vote

Why do I breathe out of BOTH nostrils?

The odds are that you're noticing the equality of patent nostrils in the middle of a changeover, when both are equally patent. Also, the shape of your nose may be permitting the congested side to ...

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