Zooming out, the Surge of Puberty across the world differ with respect to time in different individuals. This is to say that puberty is not driven just by evolutionary forces; it has a lot to do with our lifestyle and diet. For starters, we should know that for us, humans, maturity begins in the brain. The same region (part of the brain) responsible for heat control in the body releases a protein known as Kisspeptin, this – like a chain reaction – triggers every other hormone in the body by stimulating them to maturity. In this article, we take ourselves from teens, through adulthood and finally sex, in the first two decades of life, our body accomplishes something incredible – so we may want to pay a little more attention – we become about 4 times our original height, we are 21 times heavier, we have digested about 9 tons of food, our heart has beaten over a billion times and by now our lungs have drawn over 200 million breaths.
Girls are left to experience ovulation. Looking Inside her ovary, some off-white organs contain the eggs in a protective blister of fluid, and at ovulation the blister is opened for the egg to travel through the fallopian tube, leaving it to one of two fates: Fertilization or waste as Menstruation.
It naturally seems like the task of the ovary is done just once a month, but this is not the case, the ovary start releasing hormones like estrogen into the bloodstream; these hormones will end up contributing so much to our emotional life and how we physically look.
In boys; the brain releases the same chemical to start the process, his body starts to produce sperm, testosterone becomes abundant producing pubic hair and multiplying its mass, his voice changes as his vocal cords stretch out – making the longer cords to vibrate at a lower deeper pitch.
In our brain; the nerve cells are rewired, making us react differently to situations and senses, the change comes with a flood of emotional attraction to the other sex. Here we may say that we have a crush when we see them: Our pulse begin to race and our blood pressure starts to rise, our lips get cold and our chicks get flooded with blood (Blushing now).
Our twenties are the time of our lives when we are most exposed to the outside world. Trillions of cells make us up and over time some of them will get worn out and damaged, cells multiply themselves to replace other cells and with time an entire organ will completely change, in fact, we get a brand new body about every 3 years.
Our hair is a product of the recollection of dead cells, each hair is shot out from hair follicles inside our skin. The cells there grow and die as they are being pushed up outside the skin. This incredible process repeats itself, so the average youth will grow about 11 thousand meters of hair every year.
Choices that we make now – relative to our body- will affect us for the rest of our life. Take exercise for example; it strengthens the heart: the heart is the most hardworking organ in the human body, running a few miles strengthens its ability to pump more blood with fewer pumps and beat slower. In the lungs, as we exercise extra capillaries grow, allowing us to draw more oxygen with each breath. We put pressure on our bones encouraging it to grow more bone fibers thus making it firm and dense. Our muscles are made up from bundles upon bundles of fibers tied together into flesh; a very good workout rips these fibers apart, the tearing affects whole surfaces by force, by the end of the day our cells come to repair the (good) damage that has been done and therefore adds more fiber for glue.
Some choices we make are less beneficial though, when we are in our twenties parties are a part of our lives, here we do things that are (not) so good for us, take smoking for instance; everybody knows how smoke isn’t good for our lungs, yet this is not the only threat here, since the day we were born our ears have been gradually damaged by loud noise, deep inside the ear, past the ossicle bones inside the cochlea, many tiny fine hairs turn vibrational wave (sound) into electrical impulses for the brain, loud noise destroys these hairs because of how hard their foundations vibrates and they are irreplaceable.
Alcohol, as much as is a norm in social gathering between the young and old, is a poison. As we start the process of absorption from our gut to our bloodstream it affects our organs and our brain. A few glasses increase the heart rate and blood pressure, makes us feel relaxed, the operation of the prefrontal cortex in the brain (deals with decision making) is drastically reduced. The way we feel when we are drunk is as a result of chemical reaction mostly in the cerebellum (responsible for coordination and balance), our neurons become chemically imbalanced, what happens is, while some synapses are made to receive more neural signals, others begin to completely reject any interaction, as we take in more alcohol it gets even worse. We make the brain believe that there is excess water in the body and this sends the kidneys to instability, thus making them send all the water to the bladder. We feel the results the next morning and cry: Hangover, alas.
After a hard party, we leave the job for our liver to clean up the mess, the Liver is the center for biochemical control in our body, it does over half a million tasks, one of them being to break down harmful chemical mixtures (like alcohol) to less harmful once. Doing this job requires a lot of water and right now our body is short of storage, however, the liver doesn’t care where it takes this water from, it takes as much as it needs from the body by force. Our brain is 75 percent water and is usually drained by the liver; water is sucked out and the brain shrinks away from the skull, making us experience a very special kind of a headache (the best cure for a handover is drinking water).
Now it’s time to find love and have children of our own, many people meet their partners at work. It is easy to think that the attraction is completely social and just physical, but most of it is actually biology, we use our eyes to size up our date, but looks are not everything because attraction is also about “Smell”. Not just looks, through the nose, we detect the Pheromones (a chemical substance secreted externally by some animals that influences the physiology or behavior of other animals of the same species) that is released from the sweat our crush, they carry information about their genetic health and their ability to resist disease. Our brains detect these hormones to help us choose a partner with better genes.
It all starts with adrenaline rushing into the body at the first sight of our partner, then as we get closer to them we begin to experience a flood of dopamine when they are around, just like cocaine, it induces euphoria which is very addictive.
Sex isn’t just about bringing in new species, it also strengthens the chemical-emotional bond between two people, during orgasm the brain releases a chemical called oxytocin (the bonding hormone) into the body – this hormone is also responsible for making us bond so much with our mothers earlier- the more sex these adults have the more they get flooded with oxytocin, the more they bond.
In women; an egg (the largest cell in the female human body) reaches maturity and bursts out from the ovary, it goes through the same process others have gone through in the hundreds of months before it, but this time this one is about to become a baby. The sperm (the smallest cells in the male human body), about 300 million of them enter the vagina during ejaculation. First, they must survive the hostile environment of the vagina which contain acidic secretions to prevent the spread of bacteria but this acid kills sperm. Most of the sperm die before they reach the cervicis, the ones who survive reach the fallopian tube which uses muscle contractions to push the sperm up to the egg. Only a few hundreds are able to make it this far but only one will complete the journey. It is truly a survival of the fittest, only the sperm, with the best, strongest, fastest and efficient DNA will survive.
So far there is no sign that anything has happened, we will go about our normal lives but over the next forty weeks, the cell will develop into a fetus. The first symptom is morning illness, you may find it incredible to know that we are not sure as to why women vomit while they are pregnant. One research has shown that it could help protect the fetus from toxins in our food. Some other researchers claim that it is a side effect of the immune system as it weakens to prevent itself from attacking the new developing organism. The fetus, under technical terms, is a parasite, it steals energy from the host its mother to help itself without really contributing much to her biology. It uses a life support system called the placenta, where the mother passes all the nutrient into the fetus through a series of membranes.
In 10 weeks the baby will be about 850 grams and the uterus has to expand about a thousand times to hold the baby. The body has to create extra space for the baby to stay in, when women are not pregnant their organs are in a tight fit, and when are their organs are pushed to the back and up the chest, the lungs and heart have to work twice as much because of the extra load, the spin is curved out of shape, the stomach is compressed and rotated (allowing for the storage of small food). Finally, after 9 months the baby is ready to come forth. Softened tendons allow the body to open up the birth canal, however, sometimes it is still very difficult for the baby to come through, the baby has to pass through a tight squeeze, twisting through the tailbone. In some cases, women have to literally get opened up for safe delivery.
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