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98

Apparently you're not the first person to notice this; in 1895, a German nose specialist called Richard Kayser found that we have tissue called erectile tissue in our noses (yes, it is very similar to the tissue found in a penis). This tissue swells in one nostril and shrinks in the other, creating an open airway via only one nostril. What's more, he found ...


40

This is 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, controlled by the autonomic nervous system. If you notice alternating congestion, that also seems to be coupled to the nasal cycle (Hasegawa and Kern 1977, 1978). ...


12

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 article about this that explains: ...it makes our sense of smell more complete. Different scent molecules degrade at different rates, and our scent ...


9

The female breast is composed primarily of fat and connective tissue plus lobules and ducts for milk production and delivery. The pectoralis muscles form a thin layer beneath the breast, as seen in the figure in the link. An athletic female can enlarge the size of the pectoralis muscle and the laterals muscles, just as male athletes can enlarge their "pecs" ...


5

They would die. Let's imagine that we perfectly cut a person down the middle. That would mean cutting the spinal cord in half, probably damaging the tissue so much that the remaining half wouldn't work well. The liver would be gone. The intestines and bladder would just be open. The heart would have to be adjusted to the left. The surgery would probably ...


5

They don’t meet. Some framework: Spinal nerves contain motor, sensory, and autonomic fibers. Each of these have different pathways. Spinal nerves don’t go to the brain. Rather, they synapse in the spinal cord with other neurons which in turn go to the brain (sometimes requiring one more synapse). In the case of motor neurons, we talk about upper and ...


4

You cannot change the oxygen concentration of inhaled air in the absence of an external source of oxygen. However, you can use your lungs at their maximum capacity doing this: breathe deeply: =increase tidal volume. Your muscles will inflate your lungs as much as they are able to, inflating parts of the lungs that were not fully inflated (atelectases) in ...


2

There is a nice video which can give you a comprehensive answer. Also you can find references in the description below the video: Why Do We Have Two Nostrils? (by Vsauce) link: https://www.youtube.com/watch?v=eiAx2kqmUpQ


1

How many more weeks in utero does Karp think would be ideal? I don't know Karp at all, but a quick search indicates he's known for soothing babies by swaddling. Great. My mother swaddled all her infants many decades ago. If he is comparing human neonates to primate neonates, he's correct. Baby primates are born pretty much knowing how to cling onto the ...


1

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 still be fairly patent. Your nose is doing what it's supposed to be doing (and everybody suffers bilateral congestion during colds, allergies, etc.) If it were not, ...


1

I have not been able to find any studies that look specifically at the genetic mechanism for nose development. I certainly do not know but I'll offer up two hypotheses. My first hypothesis is that the elongated nose is a remnant of the elongated lower face of our ancestral species, as you note in your answer. Take a look at this brief YouTube video (1:17 ...



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