What vessels does darker blood travel through, what color is the blood in the veins, and why is it darker than arterial
Content:
- The color of blood in the veins and its function
- Why venous blood is darker than arterial
The constant movement of blood through a closed cardiovascular system, which provides gas exchange in tissues and lungs, is called blood circulation. In addition to saturating the organs with oxygen, as well as purifying them from carbon dioxide, blood circulation is responsible for delivering all the necessary substances to the cells.
Everyone knows that blood is venous and arterial. In this article, you will find out through which vessels darker blood moves, you will find out what is included in this biological fluid.
This system includes blood vessels that permeate all tissues of the body and the heart. The process of blood circulation begins in the tissues, where metabolic processes take place through the capillary walls.
The blood, which has given up all the beneficial substances, flows first to the right half of the heart, and then to the pulmonary circulation. There, she, enriched with useful substances, moves to the left, and then spreads in a large circle.
The heart is the main organ in this system. It is endowed with four chambers - two atria and two ventricles. The atria are separated by the interatrial septum, and the ventricles are separated by the interventricular septum. The weight of a human "motor" is from 250-330 grams.
The color of the blood in the veins and the color of the blood moving through the arteries are slightly different. You will learn a little later about the vessels through which darker blood moves, and why it differs in shade.
The artery is a vessel that carries a biological fluid saturated with useful substances from the "motor" to the organs. The answer to a rather frequently asked question: "What vessels carry venous blood?" simple. Venous blood is carried exclusively by the pulmonary artery.
The arterial wall consists of several layers, these include:
- outer connective tissue sheath;
- medium (it consists of smooth muscles and elastic hairs);
- internal (consisting of connective tissue and endothelium).
Arteries divide into small vessels called arterioles. As for the capillaries, they are the smallest vessels.
The vessel that carries carbonated blood from the tissues to the heart is called a vein. An exception in this case is the pulmonary vein, since it carries arterial blood.
For the first time, Dr.V. Harvey back in 1628. The circulation of the biological fluid occurs through the small and large circles of blood circulation.
The movement of biological fluid in a large circle starts from the left ventricle, due to the increased pressure, the blood spreads throughout the body, nourishes all organs with useful substances and takes away the harmful ones. Further, the transformation of arterial blood into venous blood is noted. The last stage is the return of blood to the right atrium.
As for a relatively small circle, it starts from the right ventricle. First, the blood gives off carbon dioxide, receives oxygen, and then moves to the left atrium. Further, through the right ventricle, the flow of biological fluid into the great circle is noted.
The question of which vessels carry darker blood is quite common. Blood has a red color, it differs only in shades due to the amount of hemoglobin and oxygen enrichment.
Surely many remember from biology lessons that arterial blood has a scarlet hue, and venous blood has a dark red or burgundy hue. Veins located near the skin are also red when blood circulates through them.
In addition, venous blood differs not only in color, but in function. Now, knowing in which vessels the darker blood moves, you know that such a shade of it is due to the enrichment of carbon dioxide. The blood in the veins has a burgundy hue.
It has little oxygen, but at the same time it is rich in metabolic products. It is more viscous. This is due to an increase in the diameter of the red blood cells due to the intake of carbon dioxide in them. In addition, the temperature of the venous blood is higher and the pH is lower.
It circulates through the veins very slowly (due to the presence of valves in the veins that slow down the speed of its movement). The veins in the human body are much larger than the arteries.
What color is the blood in the veins, and what functions does it perform?
You know what color the blood is in your veins. The hue of the body fluid determines the presence of hemoglobin in red blood cells (erythrocytes). The blood circulating through the arteries, as already mentioned, is scarlet.
This is due to the high concentration of hemoglobin (in humans) and hemocyanin (in arthropods and molluscs), enriched with various nutrients.
Venous blood has a dark red tint. This is due to oxidized and reduced hemoglobin.
At least it is unreasonable to believe the theory that the biological fluid circulating through the vessels bluish in color, and if injured and in contact with air due to a chemical reaction, immediately blushes. It is a myth.
Veins can only seem bluish, due to the simple laws of physics.. When light hits the body, the skin beats off part of all the waves and therefore looks light, well, or dark (this depends on the concentration of the coloring pigment).
What color is the venous blood, you know, now let's talk about the composition. You can distinguish arterial blood from venous blood using laboratory tests. Oxygen tension -
The outflow of blood, carrying carbon dioxide and products that are formed during metabolism, is carried out through the veins. It is enriched with useful substances that are absorbed into the walls of the gastrointestinal tract and produced by the liquid substances.
Now you know what color the blood is in the veins, familiar with its composition and functions.
The blood flowing through the veins overcomes "difficulties" during movement, which include pressure and gravity. That is why, if they are damaged, the biological fluid flows in a slow trickle. But in case of injury to the arteries, blood sprays like a fountain.
The speed at which the venous blood moves is much less than the speed at which the arterial blood moves. The heart pushes blood out at high pressure. After it passes through the capillaries and turns into a venous pressure, a decrease in pressure to ten millimeters of mercury is noted.
Why venous blood is darker than arterial blood, and how to determine the type of bleeding
You already know why venous blood is darker than arterial blood. Arterial blood is lighter and is due to the presence of oxyhemoglobin in it. As for the venous, it is dark (due to the content of both oxidized and reduced hemoglobin).
You have probably noticed that blood is taken from a vein for analysis, and you probably wondered, "why exactly from a vein?" This is due to the following. The composition of venous blood includes substances that are formed during metabolism. In case of pathologies, it is enriched with substances that, ideally, should not be in the body. Due to their presence, a pathological process can be identified.
Now you know not only why the blood in the veins is darker than the arterial, but also why the blood is taken from the vein.
Everyone can determine the type of bleeding, there is nothing difficult about it. The main thing is to know the characteristics of the biological fluid. Venous blood has a darker tint (why venous blood is darker than arterial blood is indicated above), and it is also much thicker. When cut, it flows out in a slow stream or in drops. But what about the arterial, it is liquid and bright. When injured, it splashes with a fountain.
It is easier to stop venous bleeding, sometimes it stops by itself. Typically, a tight bandage (applied below the wound) is used to stop the bleeding.
What about arterial bleeding, then everything is much more complicated. It is dangerous because it does not stop by itself. In addition, blood loss can be so large-scale that death can occur literally in an hour.
Capillary bleeding can open even with minimal injury. The blood flows out calmly, in a small trickle. Such damage is treated with brilliant green. Then a bandage is applied to them, which helps to stop bleeding and prevent the entry of pathogenic microorganisms into the wound.
As for the venous, in case of damage, the blood flows out somewhat faster. In order to stop bleeding, a tight bandage is applied, as already mentioned, below the wound, that is, farther from the heart. Next, the wound is treated with 3% peroxide or vodka and bandaged.
As for the arterial, it is the most dangerous. If an injury has already happened and you see that there is bleeding from the artery, you must immediately raise the limb as high as possible. Next, you need to bend it, pinch the wounded artery with your finger.
Then a rubber band is applied (a rope or bandage is suitable) above the wound site, after which it is tightened tightly. The tourniquet must be removed no later than two hours after application. At the time of applying the bandage, a note is attached, which indicates the time of the application of the tourniquet.
Bleeding is dangerous and fraught with severe blood loss and even death. That is why, in case of injury, it is necessary to call an ambulance or take the patient to the hospital on their own.
Now you know why the blood in the veins is darker than the arterial. The blood circulation is a closed system, which is why the blood in it is either arterial or venous.
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