Urban: His understanding is incredible, and he becomes an immortal starting from practicing martial

A month later.

"Puff pass!!puff !!

".

The sound of the heartbeat sounded like a war drum, and the sound waves of the same frequency resonated, so that the kinetic energy was transmitted to the limbs and internal organs... Deep into the bone marrow.

In addition, various chemicals are incorporated into the bone marrow and absorbed by the bone marrow, making the bone marrow healthier and stronger.

The bone marrow of an adult is one of the largest tissues in the human body and is divided into red and yellow bone marrow according to structure.

Red bone marrow is the hematopoietic tissue of the human body, distributed in the bone marrow cavity, and also contains a small amount in the Harvard's canal, which is mainly composed of blood sinuses and hematopoietic tissue.

The sinus is a sinus-like cavity formed after the capillary branch of the artery that enters the red bone marrow, which is irregularly shaped and varies in diameter and size, and the sinus wall is lined with endothelial cells and the outside is attached by basal membrane and pericytes.

Hematopoietic tissue is located between the blood sinuses, and its matrix is reticular fibers and reticular cells, which form a mesh, and the mesh is filled with various free cells, such as various blood cells and mesenchymal cells at different stages of development.

In the primogenital period, the bone is filled with red bone marrow and has an active hematopoietic function.

In adulthood, red bone marrow is mainly found in the epiphysis of some flat bones, irregular bones and long bones, with vertebrae, sternum and iliac bones being the most abundant, and the hematopoietic function is also the most active.

In addition to hematopoietic functions, red bone marrow has a variety of functions such as defense, immunity, and wound repair. Its wound repair function is mainly due to the naïve mesenchymal cells, which retain the potential to differentiate into fibroblasts and osteoblasts.

Some scholars have used red bone marrow cultured bone marrow stromal cells to implant fractures and bone defects, and have shown that they can promote bone tissue formation, which is conducive to fracture healing and defect repair.

The yellow bone marrow is mainly composed of adipose tissue, that is, the stromal cells of the bone marrow are largely transformed into fat cells, with only a small number of naïve cell masses, and its hematopoietic function is weak.

The yellow bone marrow of adults produces red blood cells, granulocytes, platelets, and some lymphocytes.

Many factors are involved in the regulation of bone marrow hematopoiesis: the decrease in oxygen in the blood, which stimulates the formation of red blood cells, the increase of red blood cells due to the same high-altitude life, the increased mitosis of cells in the bone marrow due to blood loss, the promotion of red blood cell formation by proteins in food, and the presence of vitamin B2 in the normal process of red blood cell formation.

In adults with high anemia and blood loss, yellow bone marrow can be transformed into red bone marrow.

As the bone marrow was exercised to the extreme, Bai Xuan could clearly feel the subtle changes in his body.

As the bone marrow cells become more active, part of the system is integrated into the bone tissue, which not only begins to strengthen the bone skeleton to a certain extent.

It also causes the skeleton to secrete some impurities that are difficult to eliminate, making the skeleton harder and cleaner.

And these impurities are naturally quickly eliminated with the excretory system of the human body.

Some of them go to the intestines, some of them go to the kidneys, and some of them are naturally secreted by the skin as the pores open.

And that's not all,

The hematopoietic function of the bone marrow has also been greatly improved, and new blood has begun to be produced healthier and more nutritious rapidly.

The new blood is integrated into the old blood, and the old blood can naturally be excreted as garbage.

Like impurities in bone tissue, some of this old blood enters the intestines, some enters the kidneys, and some is excreted by the skin as the pores open.

"It's time to take a shower. "

"I have to go to the toilet after taking a shower. "

"Easy tendon marrow washing, marrow refining and blood exchange ......".

"This movement is greater than the consummation of external refining and the consummation of internal refining. "

"It seems that my body is about to undergo a major transformation. "

While thinking, Bai Xuan walked into the bathroom.

Bathe first, then excrete.

Then standing in front of the mirror, looking at himself as if he was three or four years younger, Bai Xuan didn't know what to say for a while.

"Although the height has not changed, the facial features have not changed. "

"But the overall temperament, and this special feeling, really gives me a feeling of being three or four years younger. "

"This change seems to be a bit beyond my expectations. "

"But I can also guess a thing or two about the principle. "

"It's nothing more than that almost all of my functions have been improved, and exercising the bone marrow to the extreme as a threshold point has caused me to have a reverse growth phenomenon. "

"But the only question I'm concerned about right now is whether this reverse growth phenomenon can bring my body back to puberty and develop again. "

Bai Xuan knew that after a human individual enters puberty, the speed of individual growth and development is greatly accelerated, and there is a second peak of growth and development, which is called the growth spurt of puberty.

During puberty, the hormonal activity of the human body is strengthened, especially the release of growth hormone and thyroid hormone in the body, resulting in rapid growth in height and weight.

The increase in height and weight will naturally enhance the body's functions.

The circulatory system has experienced a secondary growth acceleration, the heart rate and pulse begin to slow down, the lung structure is gradually improved, the alveolar capacity increases, the respiratory function is further strengthened, and the lung capacity increases.

During this period, the total amount of white matter in the brain rises linearly, and the total amount of gray matter shows a U-shaped trend.

The prefrontal cortex, which is responsible for higher cognitive functions such as decision-making and cognitive control, forms more myelin, making it more efficient for individuals to process information.