How do human blood vessels get blood into flesh?

The blood circulatory system is the channel through which blood flows through the body, which is divided into two parts: the cardiovascular system and the lymphatic system.

The cardiovascular system is a closed transport system consisting of the heart, arteries, capillaries and veins. The constant beating of the heart and the power that provides the blood to circulate in it provide various cells of the body with substances for survival, including nutrients and oxygen, and also take away carbon dioxide, the product of cell metabolism. At the same time, many hormones and other information substances can also reach their target organs through blood transportation, so as to coordinate the functions of the whole body, therefore, maintaining the blood circulatory system in good working condition is the condition for the body to survive, and the core of which is to maintain blood pressure at a normal level.

Blood beats out of the left ventricle and flows through the aorta and several arterial branches derived from it, sending blood to the corresponding organs. The artery then branches several times, the diameter of the tube gradually narrows, the number of blood vessels gradually increases, and finally reaches the capillaries, where the intercellular fluid is exchanged with the tissue cells. Oxygen and nutrients in the blood are absorbed by the tissues, and carbon dioxide and other metabolites in the tissues enter the bloodstream, turning arterial blood into venous blood.

The veins gradually thicken and decrease in number, until finally all the veins converge into the superior and inferior vena cava, from which blood returns to the left atrium, thus completing the systemic process.

In the same upstairs, there is no blood in the flesh of the person, only in the blood vessels, and the cells are called intracellular fluid. The outer one is called extracellular fluid. External fluids include lymphatic fluid, tissue fluid, and blood, and these two can be said to be the same, but they are located in different locations and can be exchanged with each other.

Lymph to the blood in the interstitial fluid The blood can go to the interstitial fluid, but not to the lymph. In general, the yellow fluid on the hands and body is tissue fluid and plasma.

The blood is only in the blood vessels.

There's no blood in the flesh, it's tissue fluid, and there's blood in the cut because the capillaries are broken.

Just like the railway, the man is the map of China, and there are stations in the body.

Blood vessels are divided into arteries, veins and capillaries, arteries are blood vessels that transport blood from the heart to various parts of the body, the blood vessel wall is thick, the elasticity is the largest, the lumen is small, and the blood flow speed is fast; Veins are blood vessels that send blood back to the heart from all parts of the body, the walls of venous vessels are thin, the elasticity is small, the lumen is large, and the blood flow speed is slow; Capillary is the blood vessel that connects the smallest artery and vein, the lumen impulse is the smallest, only red blood cells are allowed to pass through the single scattered field, the capillary wall is only composed of a layer of epithelial cells, the blood flow in the tube is the slower, the largest number, and the distribution is wide This structural feature facilitates the exchange of substances between blood and tissue cells

So the answer is: heart.

1. In fact, the food we eat cannot be directly absorbed by the body, but through digestion, the nutrients in the food are first transformed into small molecules that can be diffused into water. Then through the intestines, we absorb the small molecules that are useful to us into the human body, and different nutrients are absorbed in different ways.

2. For water, vitamins and minerals, which can no longer be decomposed, the human body mainly absorbs them in the small intestine.

Water-soluble vitamins and minerals are transported into the bloodstream, while fat-soluble vitamins are absorbed into the lymph along with the oil. Of course, there are some organically boiled minerals that enter the body through other routes.

The protein in food is digested by the stomach and small intestine into amino acids or short peptides composed of two to three amino acids, and then absorbed by the small intestinal epithelium in this form.

3. When fat, glucose, and amino acids enter the human body, they will be converted to each other with our needs, and in general, our body relies on glycogen and adipose tissue produced by glucose to store the energy substances we need.

When we need energy, we can break down glycogen and fat for oxidation and energy.

The various foods we eat every day are gradually digested by the digestive tract and become small molecules that can be utilized. So, how are these small molecules absorbed by our body?

The absorption of nutrients in each segment of the digestive tract is not the same. The mouth has no ability to absorb food, and the stomach can only absorb small amounts of water, inorganic salts, and alcohol. After the alcohol is absorbed by the stomach, it is immediately transferred to the liver for detoxification.

Therefore, drinking alcohol hurts both the stomach and the liver. In addition, alcohol has a toxic effect on the nervous system. Students who are in the period of growth and development should try not to drink alcohol.

The small intestine is the main organ that absorbs nutrients. The small intestine coils in the abdominal cavity and is about 5 to 6 meters long. The surface of the lining of the small intestine has a large number of annular folds, and there are a large number of finger-like protrusions - villi on the folds, and there are about 1,700 villi per square millimeter area of the lining of the small intestine.

There are also 1,000 3,000 microvilli on the free surface of each villous epithelial cell, which increases the absorptive area of the small intestine by nearly 600 times and the absorptive surface area to 200 square meters. Chyme stays in the small intestine for about 3 to 8 hours so that nutrients can be fully absorbed by the villi of the small intestine. Each small intestinal villi contains a capillary network and a chylous duct, and nutrients pass through the villus cells through active and passive actions, and further reach the capillaries or chyle ducts.

Among them, water, glucose, amino acids, water-soluble vitamins and certain fatty acids are absorbed into the blood circulation through the capillaries of the villi of the small intestine, while fats and fatty substances are absorbed into the capillary lymphatic vessels in the villi of the small intestine, and then enter the blood circulation through the lymphatic circulation. The large intestine absorbs water and some vitamin K and vitamin B substances synthesized by bacteria in the intestines.

After absorption, some nutrients are stored in the liver, and some are circulated back to the body with the blood for the needs of all parts of the body.

The physical gold esophagus enters the stomach and then to the large intestine where it is broken down and absorbed. The physical gold esophagus enters the stomach and then to the small intestine where it is broken down and absorbed. And then pass.

Molecule exchange enters. The capillaries in the gut contain nutrients. As the blood is transported to the cells of the body's organs.

Drawing blood in the flesh is not bloody. It should be next to the blood vessel (not in a straight line with the blood vessel), but in fact, the needle is still pierced into the blood vessel, otherwise the blood will not be drawn.

Normal transport of blood is possible.

Arterial blood is due to the contraction of the heart pumped into the blood vessel from the left heart, and then the blood is transported forward by the rhythmic contraction of the arterial blood vessels, after flowing into the venous blood, during the systole of the heart, the blood is pressed forward by the pressure of the heart, because the elasticity of the venous blood vessels is not as good as the arteries, so it does not have voluntary contractility, but there are venous valves on the venous vessels, and the diastolic phase can prevent the blood from flowing backwards in the veins, and finally the venous blood flows back into the right heart, and then through the pulmonary circulation, such as the left heart, so that the blood circulation is formed.

To put it more roughly well.

Downstairs, copy-paste, anyone will, you won't be so obvious, just copy and paste my answer. Moral decay.

Why does blood flow in the human body?

Venous-atrium-ventricle-arterial.

The rhythmic beating of the heart pushes blood through the cardiovascular system in a circular direction. Blood circulation is a scientific concept proposed by Harvey in England in 1628 based on a large number of experiments, observations, and logical reasoning. However, due to the conditions at the time, he did not fully understand how blood flowed from arteries to veins.

In 1661, Malpigi, Italy, discovered the capillaries between arteries and veins under a microscope, thus completely proving Harvey's correct inference. In the process of evolution of animals, the forms of blood circulation are diverse. The circulatory system is composed of open and closed types; There are single cycle and double cycle pathways.

Human blood circulation is closed, and it is composed of two pathways: systemic circulation and pulmonary circulation. Blood ejects from the left ventricle and flows through the aorta and its branches at all levels to the capillaries of the whole body, where it exchanges substances with interstitial fluid, supplies oxygen and nutrients to tissue cells, transports carbon dioxide and metabolites, and turns arterial blood into venous blood; It then flows back to the right atrium through the confluence of the veins at all levels to form the superior and inferior vena cava, and this cycle is called systemic circulation. Blood ejects from the right ventricle and flows through the pulmonary artery to the pulmonary capillaries, where it exchanges gas with alveolar air, absorbs oxygen and excretes carbon dioxide, and venous blood becomes arterial blood; It then flows back to the left atrium through the pulmonary veins, and this cycle is called the pulmonary circulation.

Blood vessels include arterial blood vessels, venous blood vessels, and capillaries which have different structures and different functions

1) A arterial blood vessels transport blood from the heart to all parts of the body, mostly distributed in deep parts of the body, with thick walls, large elasticity, small lumen, and fast blood flow B veins are blood vessels that send blood from all parts of the body back to the heart c capillaries for material exchange, the number is widely distributed, the wall is the thinnest, the lumen is the smallest, only a layer of epithelial cells is composed, and the blood flow speed is the slowest

2) It is easy to see on the surface of the body, it is "cyan", commonly known as "green tendons" are veins Some pulsating blood vessels are arteries on the surface of the human body

3) c capillaries carry out material exchange, the number is large and widely distributed, the wall is the thinnest, the lumen is the smallest, only a layer of epithelial cells is composed, and the blood flow speed is the slowest

So the answer is: (1) heart; all over the body; parts of the body; cardiac (2) B vein; a artery (3) c; Many; Wide; The thinnest.

Is there a prescription to clean the blood vessels? Yes, please see:

If you are already suffering from hardening of the blood vessel wall, that is, you have already suffered coronary arteriosclerosis heart disease, don't worry, there is a very effective way to clean the blood vessel wall.

The Chinese herbal medicines used are as follows:

Salvia, Gastrodia, Tiansan.

7. Hawthorn, American ginseng, melon shell, Polygonum multiflori.

The amount of the above seven herbs is the same, 20 grams is all 20 grams, 40 grams is all 40 grams, and 100 grams is all 100 grams. Then put all the seven herbs together and beat them into powder.

Put the powdered seven flavors in a good sealed moisture-proof crisper box, and then take a small spoonful in the morning and a small spoon in the evening. People who travel a lot can also put the powder in an empty capsule shell of "Zero" (available in pharmacies) and take five in the morning and five in the evening.

People with coronary heart disease should take vasodilator drugs every day (vasodilator drugs are the target of ** disease). Take these seven flavor medicine again (the seven flavor medicine is the root of the ** disease).

Can make the condition**. But remember the saying that illness comes like a mountain, and illness goes like a thread. Generally, after half a year, there will be no pain in the precordial area of people with angina.

Blood vessels, 10 seconds to clear blood vessels, hurry up and act on.

There are many factors that contribute to the flow of blood in the blood vessels, not just the driving force of the heart, but also the various osmotic pressures that I can't explain here.

There is plaque in the blood vessels, which is a characteristic of arteriosclerosis, generally speaking, the first thing to control is the underlying disease, such as hypertension and diabetes, and it is necessary to control it well.

There is also the need to exercise more, eat a lighter diet, and eat more organic vegetables. A detailed ** opinion can only be determined in combination with clinical symptoms and other examinations.

What is the blood force that can flow in the blood vessels?