1.The heart also has taste receptors.
A team of researchers at the University of Queensland has found that smell and taste receptors, which are normally found in the nose and mouth, may also be present in the human heart. The Academy of Biomedical Sciences team was able to observe the presence of receptors as part of their ongoing study of human heart growth during disease.
Professor Walter Thomas, head of the research team and head of the school, said the team would investigate the phenomenon, which was first spotted by former University of Queensland PhD student Dr Simon Foster. "Dr. Foster was able to demonstrate that about 12 taste receptors are expressed in the human heart, specifically those that respond to bitter compounds," Professor Thomas said. ”
2. 57% of the human body is made up of bacteria.
This is different from the early belief that the number of bacteria in the human body is 10 times the number of cells in the human body. In 2018, a study conducted by the BBC said that more than half of the human body is made up of microscopic colonists rather than human cells. James Gallagher writes, "Human cells make up only 43% of the total number of cells in the human body. "The remaining 57% are bacterial, fungal and organism cell eukaryotes that live in our gut, our mouths, our ** and female reproductive tract," said Saxo Mazmanian, a research expert in microbiology at the California Institute of Technology. There are far more bacteria than fungi and other microorganisms, and most of the microorganisms are found in the gut, so almost 57% of bacteria are gut bacteria. ”
3.Most of the cells in the human body die and are constantly being replaced.
According to researchers, the human body replaces a whole new set of cells every seven to ten years, and some of our most important parts are updated faster.
As the New York Public Library's Science Desk reference notes, "There are between 50 and 75 trillion cells in the human body, and each type of cell has its own lifespan." When a person dies, it can take a few hours or an hour for a day when all the cells in the body die. ”
The lifespan of red blood cells is about 3-4 months;The average lifespan of white blood cells is more than one year;*The lifespan of the cells is about 2 or 3 weeks;Colon cells die after about 4 days;Intestinal cells are renewed in 3-4 days;Sperm cells only survive for about 3 days;Brain cells, on the other hand, usually last a lifetime (for example, neurons in the cerebral cortex are not replaced after they die).
4. Stomach acid can even dissolve iron.
We all know about stomach acid and how it helps us digest the food we eat. But did you know that this acid in our stomach is so powerful that it can even dissolve metals?When we eat and breathe, various bacteria enter our stomach, but these bacteria cannot survive due to the hydrochloric acid in the stomach.
The acid is measured in a pH range of 0 to 14. The lower the pH, the more acidic the liquid becomes. Normally, a healthy stomach has a pH of 10-2.0。Gastric juice has a low pH and is usually free of microorganisms. But at the same time, these pH levels put stomach acid almost in the same category as battery acid, which dissolves steel. Scientists confirmed this by experimenting with simulated stomachs. Of course, no one can actually swallow metal into their stomach without getting harmed, so this phenomenon can only happen in a lab, not in a real-life human.
5.Negative emotions are more likely to cause false memories.
Charles Brainard, a professor of human development at Cornell University, said remembering negative events is more likely to lead to false memories than remembering neutral ones. This new research has important implications for the accuracy of legal testimony in criminal cases and how to better conduct interviews and interrogations in violent cases.
The researchers conducted an experiment in which about 120 participants (half in Brazil and half in the United States) were asked to read a list of words that contained positive, negative, or neutral meanings. They are then asked to identify which words are listed. They are more likely to be inaccurate when recalling negative words such as anger, sadness, anger, grumpy, and angry, and to "mistakenly recall" words that are not listed, such as anger. When positive words are recognized, their memory is more accurate.
6.In the morning we look taller and slimmer.
When you look in the mirror first thing every morning, you'll notice that your belly is flatter than at any other time of the day. This happens because most of your food has already been digested before you start eating anything. You can also lose moisture overnight, which helps to make the exterior thinner and lighter.
On the other hand, when you first wake up, you will weigh a little more than usual. When you lie down all night, the discs in your spine will spread apart slightly, increasing your height slightly. Over the course of the day, the compression of walking squeezes them back to "normal" heights. And this compression is why your average height may even drop by 1 centimeter when you run.
7.When we blush, the stomach lining also turns red.
The human stomach is a muscular, elastic J-shaped pouch. It produces a new layer of mucus every two weeks to prevent its own digestion. Blushing occurs when an adrenaline rush caused by anxiety or embarrassment causes tiny blood vessels called capillaries to spread throughout the body, increasing blood flow. This is especially noticeable on the cheeks and stomach walls, as they are close to the surface there. That is, when you blush, your stomach lining also turns red.
8.There are a lot of bacteria in the navel.
When you take a shower every day, what do you think is the place where you are most likely to neglect cleanlinessThis is most likely the navel. How dirty is your belly button?In a 2012 study published in PLOS ONE, researchers found that the belly button is home to 2,368 species of bacteria, 1,458 of which may be new scientific discoveries.