The blood in the human body turns from blood to blood after it is circulated

<> explanation: the blood circulation route is shown in the figure: blood changes from venous blood to arterial blood occurs in the capillary network around the alveoli during the pulmonary circulation Blood changes from arterial blood to venous blood in the systemic circulation Therefore, the blood in the human body changes from arterial blood to venous blood after the systemic circulation

So the answer is: arteries; Veins

After systemic circulation, the blood changes from arterial to venous.

The process of systemic circulation:

1. When the ventricle contracts, bright red blood (arterial blood) containing more oxygen and nutrients is exported from the left ventricle, through the aorta and its branches at all levels, to the capillaries of all parts of the body.

2. Then the capillaries carry out intratissue material exchange and gas exchange, and the blood becomes slightly purple blood (venous blood) containing tissue metabolites and more carbon dioxide, and then passes through the veins at all levels, and finally flows into the superior and inferior vena cava and flows back to the right atrium.

Arterial blood contains more oxygen, less carbon dioxide, and is bright red. Because it is just emanating from the heart, the walls of the arteries are subjected to higher blood pressure. Arterial blood is the transport vehicle for oxygen from the alveoli to other tissues in the body (to be precise, the hemoglobin of red blood cells in arterial blood is the carrier).

Arterial blood is converted to venous blood when oxygen is absorbed by other tissues and carbon dioxide is released.

The <> blood circulation route is shown in the figure: blood lead changes from venous blood to arterial blood in the capillary network around the alveoli during the pulmonary circulation, and the blood changes from arterial blood to venous blood in the systemic circulation

Therefore, the answer is Huai Shan Lu: artery; Veins

A: There are three ways of excretion: exhalation through the lungs to expel carbon dioxide and some water vapor; Partial discharge of water, inorganic salts and urea through sweating; Tongwei Xun passes through the kidneys, urinates, excretes deficiency, and produces most of the water, inorganic salts and urea, etc., which is the main way of excretion

So the answer is: metabolic waste; Excretion.

The whole process of systemic circulation in the blood circulation: left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium.

1. The route of systemic circulation is: left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium;

2. The route of pulmonary circulation is: right ventricle, pulmonary artery, pulmonary capillaries, pulmonary veins, and left atrium.

The route of the lung loop is:

Right ventricle pulmonary vein pulmonary capillaries pulmonary veins du left atrium, when blood flows through the pulmonary capillaries, dao and alveoli carry out gas exchange, carbon dioxide in the blood enters the alveoli, and oxygen in the alveoli enters the blood, so that the blood changes from venous blood with little oxygen to arterial blood with rich oxygen; After the pulmonary circulation, venous blood becomes arterial blood

The route of systemic circulation is: left ventricle, aorta, arteries at all levels, capillary network in various parts of the body, veins at all levels, superior and inferior vena cava, right atrium, arteries send blood rich in nutrients and oxygen to the capillary network of various organs of the body, exchange substances with tissue cells, transport nutrients and oxygen for cell utilization, and at the same time transport waste products such as carbon dioxide produced by cells In this way, the blood changes from oxygen-rich arterial blood to venous blood with less oxygen Through systemic circulation, arterial blood becomes venous blood

So the answer is: arteries; VeinsVeinsArteries.

Arterial blood becomes venous blood.

The whole process of systemic circulation in the blood circulation: left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium.

1. The route of systemic circulation is: left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium;

2. The route of pulmonary circulation is: right ventricle, pulmonary artery, pulmonary capillaries, pulmonary veins, and left atrium.

When the ventricles contract, bright red blood (arterial blood) containing more oxygen and nutrients is exported from the left ventricle, through the aorta and its branches at all levels, to the capillaries of all parts of the body, where the exchange of substances and gases in the tissues is carried out, and the blood becomes a slightly purple blood (venous blood) containing tissue metabolites and more carbon dioxide, and then through the veins at all levels, and finally flows into the superior and inferior vena cava and flows back to the right atrium.

The blood circulation in the above path is called systemic circulation, also known as greater circulation. The main characteristic of the systemic circulation is that it travels a long distance and travels over a wide range, nourishing the whole body with arterial blood and transporting metabolites and carbon dioxide back to the heart.

A brief flow of systemic circulation.

When the ventricles contract, bright red blood (arterial blood) containing more oxygen and nutrients is exported from the left ventricle, through the aorta and its branches at all levels, to the capillaries of all parts of the body, where the exchange of substances and gases in the tissues is carried out, and the blood becomes a slightly purple blood (venous blood) containing tissue metabolites and more carbon dioxide, and then through the veins at all levels, and finally flows into the superior and inferior vena cava and flows back to the right atrium.

The main significance of blood circulation is to ensure the body's metabolism. The tissues of the animal body obtain various nutrients, water and oxygen from the blood, and use these substances for oxidation to produce heat energy and ensure normal function.

At the same time, the waste products such as carbon dioxide, urea, and uric acid produced by metabolism are discharged into the blood, which are transported to the respiratory organs and excretory organs respectively, and discharged from the body, so as to maintain the relative constant physical and chemical properties of the tissue. In addition, the hormones secreted by the endocrine glands are transported to all parts of the body through circulation to regulate the physiological functions of the body.

The blood circulation of the human body can be divided into two pathways: systemic circulation and pulmonary circulation, among which the route of systemic circulation is: left ventricle, aorta, arteries at all levels, capillary network of various parts of the body, veins at all levels, superior and inferior vena cava, right atrium; The route of the pulmonary circulation is: right ventricle, pulmonary artery, pulmonary capillaries, pulmonary veins, left atrium, so the answer is: left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium.

Briefly describe the whole process of systemic circulation in the blood circulation, which is very good for yourself.

Left ventricle, aorta, arteries at all levels, capillary network in all parts of the body, veins at all levels, superior and inferior vena cava, right atrium; The route of the pulmonary circulation is: right ventricle, pulmonary artery, pulmonary capillaries, pulmonary vein, left atrium.

Through the analysis, it can be seen that in the process of systemic circulation, the change of blood is from arterial blood to venous blood

Therefore, c

1) (2) In the process of blood circulation in the human body, systemic circulation: left ventricle, aorta, all parts of the body, superior and inferior vena cava, right atrium, because the blood flows through various organs to carry out physiological activities to consume oxygen, produce carbon dioxide, spike so that arterial blood becomes venous blood; Therefore, systemic circulation begins in the left ventricle and ends in the right atrium

2) The human meridian injection of drugs starts from the superior vena cava, and the drug enters the right atrium and right ventricle of the heart through the superior vena cava, and flows back to the left atrium and left ventricle of the heart through the pulmonary artery, pulmonary capillaries, and pulmonary veins, and then reaches the lesion through the aorta and arteries at all levels Therefore, the order in which the drug appears in the four chambers of the heart is 3, 4, 1, and 2

3) Among the four chambers of the heart, the right ventricle flows from Jinghong avascular blood, and the right atrium flows venous blood; Because the right ventricle is the starting point of the pulmonary circulation, the pulmonary circulation makes the blood change from venous blood to arterial blood, and the blood flows back to the left atrium of the heart after pulmonary circulation, and from the left atrium into the left ventricle to start systemic circulation, the systemic circulation makes the blood change from arterial blood to venous blood, and the blood flows back to the right atrium of the heart through the systemic circulation, so the venous blood flowing is 4 and 3

So the answer is: (1)2; 3；（2）3-4-1-2；atrioventricular valves; (3) 3 and 4