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These Questions Prove People Know Nothing About Human Anatomy
Young couple looking at each other and smiling. Photo Credit: George Rudy/Shutterstock

How Is Everyone’s Smile So Different Yet Everyone Has Relatively The Same Facial Muscular Anatomy?

mikeofarabia17: Everyone’s smile is incredibly similar, it’s just that our brains are set up to detect the small differences in human faces quickly and easily. Similarly, we can pick up on minute muscle tensions in faces to quickly assess the thoughts/moods/intentions of others.

These Questions Prove People Know Nothing About Human Anatomy
Beautiful man and woman smiling. Photo Credit: Dean Drobot/Shutterstock

SS: Exactly. This is just like the “gait” question. We’re more similar in our human anatomy than we assume. A smile is something that will differ a bit. However, faces look different more often than not. Therefore, we assume that a person’s smile is very different because we connect their face to their smile too. You and a friend could have the same smile but look different doing it, yet people might say your smiles differ when they really don’t. Your faces differ; the smile is the same. However, when they do differ, this is often due to the teeth and jaw. They are what truly determines a smile.

These Questions Prove People Know Nothing About Human Anatomy
A crumpled piece of paper with word “Fat” in fire. Photo Credit: Vladimir Borozenets/Shutterstock

What Happens When Fat Is Burned?

Verence17: Oxygen (which you gain from breathing) plus organic matter (which mainly consists of carbon and hydrogen atoms) produces water (oxygen plus hydrogen) and carbon dioxide (oxygen plus carbon). The former is used in your body alongside the water you drink, and excess water is ejected as urine. The latter is ejected when you breathe.

These Questions Prove People Know Nothing About Human Anatomy
Woman Lifting Weights. Photo Credit: Dimid_86/Shutterstock

SS: Sooo… fat burning is often misunderstood. Fat cells actually give us our energy to fuel new activities and even work out. When you use a lot of this by working out or exercising regularly, fat cells cannot be stored as frequently. Obviously, you’re using them up. Since you are not storing fat as much, you begin to lose the fat you have on your body. This is good but it also means you need to eat more to give yourself the energy you used to get from stored fat. This is why you might see people like The Rock eat a lot, and somehow remain extremely muscular. He must eat a lot, there’s very little fat stored up to use.

These Questions Prove People Know Nothing About Human Anatomy
Potential Lab-Made Kidney. Photo Credit: Crystal Light/Shutterstock

Why Do Most Animals (including humans) Have Some Duplicate Organs (lungs, kidneys) But Only One Of Our Most Important Organ (heart)?

stecarr1: Your most important organ would most likely be your brain and central nervous system as it’s the only part that can’t be replaced. For the sake of the argument, the heart is almost a duplicate organ in itself. It has two sides that provide blood to different parts of the body. These two sides are separated by the septum. Why do we have two of some organs? Evolution, having two of some organs has given us an evolutionary survival advantage over having one. These genes are more likely to survive and get passed down to offspring. Human anatomy today is the anatomy that was most likely to survive throughout our evolution.

These Questions Prove People Know Nothing About Human Anatomy
Human Heart Arteries. Photo Credit: MDGRPHCS/Shutterstock

SS: This is true. We even have proof of this. From an evolutionary perspective, we developed these extra organs as back-ups or to lead to efficiency. Many believe we developed two lungs as part of our beginning stage to help us grow. Considering oxygen levels were much higher millions of years ago, developing duplicate lungs only ensured we’d grow into larger beings. It worked, obviously. We then realized we needed two kidneys to help filter out potential problems, like poisons we might drink accidentally. However, humans can live normal lives with just one kidney and live just fine with one lung too!

These Questions Prove People Know Nothing About Human Anatomy
Woman With Vertigo. Photo Credit: Image Point Fr/Shutterstock

Why Do People Pass Out On Thrill Rides Like Slingshots or Roller Coasters?

Skusci: The main reason is due to Vasovagal syncope, which is where your heart rate and blood pressure suddenly drops from certain triggers. Anxiety/fear/excitement that comes with roller coasters tends to set it off. With the sudden drop in blood pressure, your brain gets less blood, and that leads to unconsciousness. G-force alone causing blood to rush to your feet doesn’t usually do it (unless you aren’t healthy), but a smaller drop in blood pressure is needed for you to pass out.

These Questions Prove People Know Nothing About Human Anatomy
Asian little child girl fainted. Photo Credit: CGN089/Shutterstock

SS: This is pretty much on the mark. We pass out for numerous reasons, but it is almost always related to blood pressure. There are times our heart rate will cause this, but that in turn still triggers blood pressure differences. A person’s brain has randomly caused them to pass out, but this is extremely rare. A neurally-mediated syncope is almost the reverse of Vasovagal, as it lowers the heart rate and blood pressure. Yet it, too, triggers a pass-out or fainting episode. This tends to be something people can experience under G-Force pressure compared to thrill rides that raise both heart rate and blood pressure.

These Questions Prove People Know Nothing About Human Anatomy
T Cell lymphocyte with receptors for cancer cell immunotherapy research. Photo Credit: CI Photos/Shutterstock

What Are T-Cells and B-Cells In Medical Or Anatomy Terms and How Are They Different When Dealing With Viruses?

gamevideo113: B and T-cells are part of the adaptive immune system. They are lymphocytes that are activated to fight infection. T-cells can be divided into three main kinds: cytotoxic T-cells, which recognize and kill infected cells, T helper cells, which produce molecules called cytokines to control the immune response to a pathogen, and T reg cells, which inhibit the immune response. B-cells instead only produce antibodies, which can neutralize a pathogen and help macrophages in killing it. Some of these belong to innate immunity, others belong to adaptive immunity, while others allow an intersection between the two.

These Questions Prove People Know Nothing About Human Anatomy
B Cell. Photo Credit: Ustas7777777/Shutterstock

SS: Very spot on here. B-Cells are at the very center of the adaptive humoral immune system. They are responsible for being the middleman in our production of antigen-specific immunoglobulin, which is then directed to face off with invasive pathogens. T-Cells are responsible for trying to kill the infected host cells and then activate other immune cells with the hope of regulating our immune response in the body. Both are important to our immune system and help to keep us alive, literally.

These Questions Prove People Know Nothing About Human Anatomy
Situs inversus, a congenital condition in which the major visceral organs are reversed from normal positions. Photo Credit: Tomatheart/Shutterstock

What Happens If Our Internal Organs Get Rearranged?

Tomato_On_Uranus: As long as nothing is damaged or twisted up, it’ll basically go right back where it was. Your organs don’t flop around loose in your torso, they’re attached all over the place to the inside of your thoracic cavity. If an organ is permanently removed from the torso, the others just kinda shift around to fill the space. A kidney specifically is different because it’s in a separate “pocket” than the rest, but end result is similar. There’s not an empty hole or anything.

These Questions Prove People Know Nothing About Human Anatomy
Situs Inversus Totalis or Reversed Organs. Photo Credit: SAGES

SS: We know the person asking the question was asking it specifically in reference to c-sections. When you have one, it is true that surgeons will need to remove your organs to take out the child. For many, they are actually awake during this but are incredibly numbed up. Naturally, removing organs to get a child out is dangerous. Of course, this is why surgeons and nurses are so well trained. They know where to put them back. But even if they put them back in the wrong place, it’s not exactly a bad thing. Some people are born with their organs on the opposite side, it’s called Situs Inversus.

These Questions Prove People Know Nothing About Human Anatomy
Conjoined Twins. Photo Credit: Sk Hasan Ali/Shutterstock

How Does The Anatomy Of Conjoined Twins Work?

Straight-faced_solo: It’s different depending on each case. Usually, they have separate organs but share a circulatory system. It’s not uncommon for them to only have one heart and liver shared between the two.

These Questions Prove People Know Nothing About Human Anatomy
Siamese twins. Photo Credit: DCMshutterbug/Shutterstock

SS: This is true, and the human anatomy of conjoined twins can be wildly different depending on the case. In fact, many conjoined twins are able to be separated without it causing an issue these days. The ones that cannot be “detached” are those who share an important organ such as a brain or heart. Other stuff can be cut in half and grow back or they can live with just half. This includes both having one lung, one kidney, or half a liver. Regarding those sharing a heart, they’ll be added to a transplant list. But this can take years and there is no guarantee a new heart will work. So splitting is very risky.

These Questions Prove People Know Nothing About Human Anatomy
Woman Crying. Photo Credit: Goffkein.pro/Shutterstock

Why, After a Good Long Cry, Can’t We Take A Big Deep Breath Without That Huh-Huh-Huh Tracheal Contraction?

Gynoceros: Those “tracheal contractions” are probably either diaphragmatic or congressional intra-abdominal muscle spasms, due to the strain that had been placed on them during the crying jag. Do you know how your legs get wobbly after doing a bunch of squats? Your breathing muscles get wobbly after being worked hard too.

These Questions Prove People Know Nothing About Human Anatomy
Crying paramedic in front of isolation hospital facility. Photo Credit: Eldar Nurkovic/Shutterstock

SS: It essentially works exactly like this. A great example was given here. Yes, your diaphragm or other areas of your throat are working overtime when you cry a lot. On top of this, so are your lungs and even your sinuses. This is why when you cry, you might see a lot of “green stuff” come out. The human anatomy is interesting in this area, as we do not all cry the same but we ALL have an affected sinus or breathing issue. The same sort of thing can occur when we laugh very hard too. You’ve likely seen people who laugh so hard they cry or cough before. It’s the same principle involved.

These Questions Prove People Know Nothing About Human Anatomy
Woman having cold and sneezing. Photo Credit: HBRH/Shutterstock

Why Does It Hurt When You Can’t Start/Finish a Sneeze?

AtlasTradeM: When you sneeze, it’s because your body detected bad stuff that it wants to remove from the body. This could be something irritating or something you’re allergic to. Sometimes your body tries to sneeze but fails because bodies aren’t perfect. When this happens, that sneezing feeling stays and can be painful because the allergen never left.

These Questions Prove People Know Nothing About Human Anatomy
Man About To Sneeze. Photo Credit: Tattoboo/Shutterstock

SS: This is mostly true. Basically, and your human anatomy textbooks will tell you this too, your sinus cavity affects a ton of things. As a result, if you feel you have to sneeze then you will very well end up sneezing usually. Some people like to stop themselves from doing so and that stoppage will hurt pretty bad. If you hurt when you’re about to sneeze but stop, it is all down to the nerves you have throughout your face and sinus cavity. These will be activated and that sends pain signals to the brain.

These Questions Prove People Know Nothing About Human Anatomy
Colorful red human heart. Photo Credit: Jolygon/Shutterstock

Before We Had a Basic Concept Of Human Anatomy, Did We Use To Think That “Thought” Came From Our Heads?

[deleted-user] No. According to my psych book, across history, different cultures have thought that the “mind” existed in the liver or the heart. I would say that yes it is just placebo (to your 2nd question). I have no idea why we think love comes from the heart, maybe someone else can help?

These Questions Prove People Know Nothing About Human Anatomy
Left-Right human brain concept. Photo Credit: Kirasolly/Shutterstock

SS: Human Anatomy assumptions were pretty wild. Socrates notably claimed the heart was the center of thought. We wrote a big article about how the human heart works and killed off some assumptions. In that, we referenced how Hippocrates was genius with his original assumptions of the heart and never believed it held thought. That said, we did not really believe the brain was the center of thought until after 100 AD. Yet people like Pythagorean Alcmaeon of Croton claimed in the 5th Century BCE that the brain was the center of thought. It just took a while for the rest of us to catch on.