The skull wraps the human brain like a helmet and plays a protective role.
Once the skull is injured, it will cause damage to the internal tissues of the brain. In our daily life, we sometimes get head injuries, concussions, skull fracture and so on because we are accidentally hit by external forces.
Data show that head injuries mainly occur in traffic accidents, fights and strenuous exercise. Some experts believe that men are more prone to concussion than women. One of the reasons is that men are heavier and have a greater impact when they fall to the ground.
In addition, more importantly, because men prefer to take part in strenuous sports, such as skating, playing football, cycling, etc., it increases the probability of skull injury. Therefore, before taking part in strenuous exercise, men should be fully prepared for injury prevention and take relevant protective measures.
In view of the head injury caused by traffic accidents, good preventive measures are speed limit, careful driving and wearing seat belts. If you are working on the construction site, you should strengthen your safety awareness and wear a safety helmet to prevent unexpected accidents.
2. What is the physiological structure of the skull?
Skull, also known as skull, is the skeleton of human and vertebrate heads.
The human skull consists of 23 bones (not including 3 pairs of ossicles), which can support and protect important organs such as the brain. Skull can be divided into skull and facial skull. The former forms the cranial cavity, while the latter forms the skeletal framework of the orbit, nasal cavity and oral cavity.
There are 8 pieces in the skull. They can't move and form a whole, protecting the brain, eyes and ears. The facial skull consists of 15 bones, including the movable hyoid bone.
The skeleton of the face determines the face shape and is also the attachment point of the expression muscle. The bones of the face include cavities such as nasal cavity and oral cavity, and some cavities have sinuses filled with air and lined with mucous membranes. The existence of these holes makes the weight of the skull out of proportion to its size. It looks big, but it's actually very light.
The difference between men and women is very obvious on the skull: the forehead of men is slightly backward, and there are often bony protrusions; On the other hand, women's foreheads are straight, and their eyes are not bony.
3. What common sense does the brain have?
According to relevant research, there are eight substances that play an important role in brain growth and development: fat, calcium, vitamin C, sugar, protein, B vitamins, vitamin A and vitamin E. Therefore, foods rich in these eight substances can be counted as brain-nourishing foods. Among them, the outstanding "brain experts" are:
Walnut: It is rich in unsaturated fatty acids, which can improve the structure of the brain and make people have good brain power. So people make it.
It is the first choice of brain-nourishing food.
Fish: Both saltwater fish and freshwater fish contain a lot of high-quality protein and rich calcium, especially unsaturated fatty acids, which can decompose cholesterol and make the cerebral vessels unobstructed.
Animal viscera: rich in nutrition, containing more unsaturated fatty acids than meat, and the brain-nourishing effect is much better than animal meat itself. People with high blood lipids should eat less.
Soybean: protein is rich in plants and contains isoflavones. It is a natural phytoestrogen, which strengthens memory by acting on the hippocampus memory center of the brain. Eating a certain amount of soybeans or bean products every day can enhance memory and prevent dementia.
Auricularia auricula: contains protein, fat, minerals and vitamins. This is a good brain tonic.
Milk: contains protein, calcium, etc. , can provide various amino acids for the brain.
Garlic: It contains allicin, which has anti-inflammatory and bactericidal effects, and also has certain effects of reducing blood fat and strengthening brain.
Banana: It is rich in minerals, especially potassium ions, and also contains an amino acid, which can help the human body to make "happy hormones". Eating it regularly can relieve psychological stress and help replenish the brain.
4. What is the common sense about the human body?
The common sense of human body is as follows: 1.
There are 206 bones in the human body, accounting for about 20% of the body weight, including 29 skulls, 5/kloc-0 trunk bones, 64 upper limb bones and 62 lower limb bones. 2。
Human muscles are abundant and widely distributed, accounting for about 40% of the total human body. 3。
The human digestive tract is about 9 meters long from mouth to * * *. 4。
People have 20 primary teeth and 32 permanent teeth. 5。
When a person's stomach is particularly full, its capacity is about 3000 ml. The total length of the small intestine is 5 ~7 meters, the large intestine is about 5 meters, and the appendix is 7 ~9 cm.
7 liver weight. In China, the male population is 1230 ~ 1450g, and the female population is1100 ~1300g.
8。 The length of human trachea is 1 1 ~ 13 cm.
9。 Bladder capacity 300? 500 ml.
The maximum capacity can reach 800 ml. 10。
The length of human external ear is about 5 cm, and the human eye can distinguish 8 million different shades. 1 1。
Two-thirds of the heart is on the left side in the middle of the body, and 1/3 is on the right side, which is slightly larger than a person's fist. 12。
The cardiac cycle of atrium and ventricle is 0. 8 seconds, 0 in the atrial cardiac cycle.
1 sec jump, 0. 7 seconds static, 0 in the ventricular cardiac cycle.
2 seconds jump, 0. Six seconds later.
Therefore, the heart never feels tired. 13。
The human body produces about 654.38 billion new red blood cells every day, and the life span of each red blood cell is 4 months. 14。
The average weight of human brain is about1400g, which varies among individuals. Science has proved that it is wrong to judge people's intelligence only by the weight and size of the brain.