In the cerebral cortex of the human brain, there are up to 17 billion nerve cells - neurons, forming a network of intertwining fibers, labyrinths, entangled passages.
Our feelings and actions, accompanied by electrical impulses, are transmitted from cell to cell. Thus, mutual communication is maintained between all cells. In humans, the ratio of brain weight to body weight is the highest in comparison with any of the representatives of the animal world. If in a horse the ratio of brain weight to body weight is 1: 400, in a dog - 1: 100, then in humans it is - 1: 50
If the entire human body at rest consumes about 300 cubic centimeters of oxygen per minute, then the brain absorbs a sixth of this amount, that is, 50 cubic centimeters, regardless of whether the person is asleep or awake.
Of the 500 grams of carbohydrates consumed by a person per day, about 90 are consumed by the brain.
Brain size does not affect a person's intellectual ability. However, according to the researchers, the mind depends on synapses - contacts between neurons. The number of synapses grows during childhood and adolescence and affects intelligence. The heaviest brain - 2900 g - was found in an individual who lived for only 3 years. His brain was functionally defective.
The speed of a nerve impulse that enters or from the brain is 274 kilometers per hour.
The brain weight of normal people ranges from 1020 to 1970 grams. The brain of men weighs 100-150 grams more than the brain of women [
The brain weighs only 2% of the total body weight, but it consumes 20% of the oxygen that circulates in the blood - more than any other organ.
The brain itself does not feel pain. But this does not save you from headache - the brain is surrounded by many tissues, nerves and blood vessels, which will be the source of pain.
A three-year-old child has 3 times more nerve cells than an adult. If the baby's potential is not used to the full, then unclaimed cells die with age. Therefore, from the very infancy, you need to actively teach children.
The corpses of people executed by hanging or choosing this method for suicide may have an erection. This is caused by the pressure exerted by the rope loop on the cerebellum. In men, this may produce urine or mucus, and in women, blood from the vagina.
The left hemisphere of the brain is responsible for the right side of the body, and the right for the left.
One of the oldest methods of studying the brain is the ablation technique, which consists in the fact that one of the parts of the brain is removed, and scientists observe the changes that such an operation leads to.
Regular laughter requires the work of five different areas of the brain. A person cannot laugh when he tickles himself. The cerebellum, which is responsible for the sensations caused by its own movements, prevents this, and sends commands to other parts of the brain to ignore these sensations. An exception to this rule is tongue tickling of the palate.
It has been experimentally confirmed that cockroaches can live without a head for several weeks. The blood circulation process of cockroaches is not controlled by the brain, they breathe through small holes throughout the body, and they can exist for a long time on pre-eaten food supplies.
Dolphins need to constantly breathe atmospheric oxygen, for this they regularly surface. To provide this breathing during sleep, the dolphin's cerebral hemispheres sleep in turns.
If we talk about the smallest brain as a percentage of body weight, then in modern cartilaginous fish it is 0, 06-0, 44%, and the brain size of large dinosaurs was even smaller.
Without oxygen, the human brain lives no more than 6 minutes, and then irreversible processes of death of nerve cells begin to occur.