Why do people have fingerprints, and why do people leave fingerprints

Because human beings will evolve with the change of the environment, having a fingerprint is to increase the friction of the hand, so that it is easier to pick up things!!

Although fingerprints are now used to verify identity, the reason why humans evolved fingerprints is only because they want to increase the friction on their hands, so that it is easier to pick up things!

For thousands of years, our hands have been an important tool for finding and eating food and helping us navigate the world. These tasks are done by touch. And the reason why we need to detect and distinguish the texture of food is precisely to distinguish between good food and bad food.

A good sense of touch can help us avoid rotten or infected items. The pairing of fingerprints and Pacinian bodies is also present in other animals, such as chimpanzees and koalas, which rely in part on the sense of touch to find food.

The reason why we are so good at manipulating and processing things is because we have this keen sense of touch, and there is a constant feedback loop between what we touch and what we feel. This allows us to correct the force of holding the object in real time. For example, when you're holding something, if it slips, you need to be able to detect changes in its surface with your sensitive fingertips to maintain your grip.

Of course, the secret of the fingerprint is far more than that, life is a wonderful existence, but also an unknown existence, the birth of the fingerprint is precisely the wonder of the Creator, explore life, revere life!

Reasons why people leave fingerprints:

Fingerprints are naturally formed in the course of human evolution. The first type is obvious lines, which are lines that can be seen visually. For example, if the hand is stained with paint, blood, ink and other items, it is usually printed on the fingerprint card to become the basic information.

The second type is molding, which refers to fingerprints found on soft materials, such as candles and clay embossed on hand contact.

The third type is latent fingerprints, which are the fingerprint lines formed by the transfer of natural secretions such as sweat from the body, which are not easy to find visually, and are the most common fingerprints in the crime scene.

Latent fingerprints are often left by fingers that come into contact with grease, sweat or dust, and then come into contact with a clean surface, although these fingerprints cannot be seen by the naked eye, but can be shown by special methods and the use of some special chemical agents. The fingerprint hand model that forensic personnel most often come into contact with is latent lines.

If the fingerprint is left on the surface of non-absorbent items such as metal, plastic, glass, tiles, etc., it is easier to check the virtual method. Usually, the powder method can be used, selecting a powder with large color contrast, and sprinkling it on the surface of the item to extract a complete fingerprint; Another method is the magnetic powder method, which uses fine iron powder particles and magnets as a brush to brush back and forth to show fingerprints.

What is dermatoglyphlea? Dermatosis refers to fingerprints, palm prints, and foot prints. If divided according to the anatomical form, the main letter ant can be divided into two categories: ridge lines (protruding lines like fingerprints, similar lines on the palms and soles of the feet) and flexure lines (commonly known as lifelines, emotional lines, etc. concave large lines).

Do striae change? It won't change. The first record of ** lines in literature was made in 1832 by the Czech physician Paginje.

At that time, he had already noticed that there was a layer of wrinkles on the surface of the ** covering the palm of the burning tan, and it formed a specific pattern. The fingerprint of each finger is unique, and the fingerprint of the right hand will not be exactly the same as the fingerprint of the left hand. Like palm prints, fingerprints do not change with age, whether they are cuts, burns, lacerations or scratches, and they heal as the wound heals.

How is the reference fingerprint formed? Fingerprints are formed when the fetus is in the mother's body for three to four months, but the fingerprints change slightly during the child's growth and do not take shape until the age of 14 or so during puberty. In the process of development, although the epidermis, dermis, and stromal layer are growing together, the soft subcutaneous tissue grows faster than the relatively hard epidermis, so it will exert a steady stream of upward pressure on the epidermis, forcing the slower-growing epidermis to contract and collapse to the inner tissue, gradually bending and wrinkling, so as to reduce the pressure exerted on it by the subcutaneous tissue.

In this way, on the one hand, they are forced to attack upwards, and on the other hand, they are forced to retreat, resulting in the epidermis growing in twists and turns, and the potholes are uneven, forming lines. This process of bending and wrinkling fluctuates with the change of the upper pressure generated by the inner tissue, forming uneven ridges or folds until the development process is terminated, and finally the fingerprint is fixed until death. Do people's fingerprints change?

Reference: Heart of Heaven.

Human fingerprints don't change.

If it will change. Did you click the gate again? Fingerprint over the frame unless the fingers or toes are damaged.

Fingerprints get bigger with your fingers. And big But if you talk about the shape of the shape is not lo

Not having fingerprints is a disease. Absence of fingerprints is the absence of fingerprints on the fingers and toes.

The absence of fingerprints makes it impossible for the human body to sweat, which means that any hot day or strenuous activity can cause heat stroke. This disease is usually passed on from women in the family to the next generation, and in addition to the absence of fingerprints and the inability to sweat, people who suffer from oranges usually show a variety of different symptoms, such as thinning hair, lack of teeth, dystrophic nails, hyperpigmentation on **, etc.

From a genetic point of view, fingerprintless disease is currently thought to be caused by mutations in the keratin K14 gene; From a genetic point of view, it is dominantly inherited, and the incidence is quite low.