There are so many parts of the human body, which part is the hardest?

The hardest part of the human body is the teeth, because there is a layer of enamel on the outer layer of the teeth, which is very hard and can protect the teeth well.

The hardest should be the human skull, because the skull is to protect the brain, so it will grow very hard and play a better protective role.

Teeth are the hardest, because when humans eat, they chew food by their teeth, and the main component of teeth is calcium, which is a very hard part.

The hardest part of the human body is the teeth, because the bite force of the teeth is very strong, and at the same time, there can be very hard things.

The hardest part of the human body is the bones in our body. It can be said to be particularly stiff, and can generally withstand some things from 30 kg to 45 kg.

It is the bones on the human body, which can be said to be particularly stiff, which will make a person feel particularly reliable, and he can also carry very heavy things in life.

Tooth. Teeth are the hardest organs in the human body, and in addition to the functions of cutting and chewing, they also play a role in maintaining facial shape and assisting pronunciation. The main constituent material of the tooth is dentin (dentin), which is surrounded by enamel (in the crown part) and cementum (in the root part).

In addition to the cementum, there is a periodontal ligament made up of fibers that holds the tooth in place in the socket. The tooth has a pulp cavity, which is filled with pulp and has abundant blood vessels and nerves.

The enamel on the outside of the tooth is the hardest part of the human bodyIn terms of human tissue, dried human epidermal cells (after keratinization) are the hardest tissues;In other respects, I heard that the heart is the hardest.

Tooth enamel is the hard stuff of teeth.

Teeth: The hardest structure of the human body – teeth Many people think that bone is the hardest structure in the human body, but this is not the case. The tooth is well deserved because it contains calcium, phosphorus, magnesium and other mineral salts, which can generally withstand a force of 30-45 kilograms. Teeth are important equipment for the mechanical processing of food, as well as for aiding speech and maintaining facial shape.

1. The hardest part of the human body is the outermost layer of porcelain-white enamel of the teeth.

2. Due to the wrapping of this layer of enamel, the hardness of the teeth is very large, which is conducive to daily chewing and biting or chopping hard food. Cons.

3. The chewing behavior of teeth is an important part of digestion and absorption, if the teeth are diseased or chewed poorly, it will have a great impact on the digestion and absorption of nutrients.

4. Teeth are grown in the upper and lower jaws, divided into three layers, the outermost layer of enamel, the middle layer of dentin and the inner layer of pulp, normal adults are generally 32 teeth, and some people have not developed wisdom teeth, and the number of teeth is 28.

5. We must pay attention to the protection of teeth, because it is an important structure for digestion and absorption, and if there is tooth damage, we must seek medical treatment in time.

Teeth are a structure that many animals, people, amphibians, reptiles, birds, and highly fed animals chew on the human organs. Teeth are the hardest human organs in the human body. Generally speaking, the teeth are milky white (a little yellowish in normal people) and the material is hard.

The various shapes of teeth are suitable for a variety of main uses, including tearing and crushing food. Teeth are the innate legitimate defense equipment of animals.

There is direct evidence that the teeth of humans and other tall vertebrates originated from the scales of ancient fish ancestors, which can be confirmed in the existing great white sharks. In fact, the teeth of the great white shark are the scales of evolution. The scales and teeth are homologous organs and have the same structure:

There is also enamel and dentin, and there is also a pulp cavity inside. The medullary cavity resembles the entry of the nervous system and capillaries.

The key dividing point of the ancestors of the reptiles is not so much the second birth, nor the milk secretion, but the differentiation of the teeth and the occurrence of diphyodont, which means that the animal has only two teeth in its life, that is, the incisors and new teeth. Reptiles, on the other hand, need to continuously change their teeth throughout their lives. The teeth of mammals are differentiated into anterior teeth, molars, premolars, and molars.

Because of the differentiation of teeth, it is necessary to close the chewing surface of the left and right teeth together when chewing, and if the animal continues to change teeth throughout its life, it is very likely to get rid of this kind of closure, which will interfere with the chewing effect.

As the hardest part of the body, teeth not only shoulder the functions of cutting and chewing, but also maintain the appearance of the face and assist in phonetic pronunciation. Teeth can be divided into 4 types: incisors (incisors), canines (canines), bicuspids (premolars), and molars (molars). Each tooth is made up of a crown that is exposed outside the socket and a gum that grows inside the socket, and a crown and a neck between the gums.

The key constituent chemicals of the tooth are enamel (enamel), and the outer toast has enamel (in the crown part) and dentin (in the gum part). In addition to the dentin, there is also a periodontal ligament made of chemical fibers, which holds the tooth in place in the socket. The tooth is expressed as having a pulp cavity, which is filled with dental nerves and has ample capillaries and a nervous system.

The hardest part of the human body is the teeth. Because teeth are very rich in calcium, magnesium, and phosphorus, when these substances are combined, they form a very hard shield.

Teeth are the hardest, teeth are higher than bones on the body, because of its density and strength, teeth contain calcium, magnesium, phosphorus, and can bear a weight of 45 kg.

It's teeth, because they have the function of biting food, so they have to be very hard.

The hardest part of the human body is the teeth, because there is a layer of enamel on the surface of the teeth, its hardness can reach 96, and it can also bear a weight of about 34-50 kg, which is not easy to be destroyed, whether it is used to bite various hard items or daily diet, there is no problem, but we must also clean our teeth in time to avoid caries.

What is the hardest part of the human body.

Many people think that they know their bodies very well in life, but in fact, sometimes we also lack correct cognition, take what part of the human body is the hardest to take as an example, some people say that it is a bone, some people say it is a nail, so is this really the case?

The hardest part of the human body is the teeth, because there is a layer of enamel on the surface of the teeth, it is the hardest substance in the human body, the hardness can reach 96, can bear the weight of about 35-40 kilograms, and it is not easy to be destroyed, can be used to bite all kinds of hard items, it can be said that our daily life, drinking and searching for food, are inseparable from teeth.

However, this does not mean that teeth are indestructible, if you do not take good care of your teeth in daily life, you will also have tooth decay, and it will be accompanied by various gum diseases, because we must clean our teeth in time every day, and we cannot eat a lot of dry sweets.

1.Tooth. 2.

The hardest part of the human body is the teeth, most of the teeth are rich in calcium, phosphorus, magnesium and other mineral salts, which can withstand 60-90 catties of annihilation force, the surface of the teeth is enamel, which is the hardest substance in the human body, and the enamel is in the outermost layer of the crown of the tooth, and the hardness reaches 6 (the hardest diamond is 10), which is only a little softer than diamond.