Blood circulation; Blood details part-3
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Blood carrier: The one that carries blood i.e. carries blood from one part of the body to another is called blood carrier. In straight Bengali it works like a pipe.
There are mainly three blood carriers
3. Capillary reticulum
But because it works to carry the heart and blood, many people consider it as a carrier of blood. According to his calculations, there are four blood carriers
3. Capillary reticulum
We will now know the details including arteries, veins, capillaries.
In English it is called artery. Its main function is to transport blood from the heart to the rest of the body. Ancient arteries have three layers. Arteries do not have any type of valve. As it has three layers, its groove is narrow.
When the heart contracts, blood travels through the arteries throughout the body. The blood moves like a wave at this time. Which causes the arteries to constrict and dilate. And it tends to vibrate. This vibration is found in our wrists. Which is called pulse vibration.
Arteries usually carry oxygen-rich blood from the heart to the rest of the body.
But the exception is the right artery that carries carbon dioxide blood from the heart to the lungs. It is called the pulmonary artery because it works exceptionally well.
The veins that carry blood throughout the body to the heart. There are many tiny veins all over the body. Whose job is to hope to get the blood back to the heart.
The artery-like vein wall consists of 3 layers. But the wall of the vein is thinner than the wall of the artery. They are not narrow because their walls are thin. Their cavity is large. If there is no valve in the artery and there is valve in the vein. Which causes the blood to flow slowly in a one-way way.
The veins usually carry carbon-di-oxide-laden blood from the whole body to the heart.
But like the arteries, it also has an exceptional vein, called the pulmonary vein. This vein transports oxygen-rich blood from the lungs to the heart.
The capillary reticulum is the intersection of arteries and veins. On the other hand, capillaries are hair follicles that are as thin as hair on the muscles. It has arteries on one side and veins on the other side.
The capillary network is the main medium for the exchange of nutrients, oxygen, carbon dioxide and excretory substances in the blood.
The most important thing in blood circulation is the heart. It is called Heart in English. The heart is a kind of pump. The heart is what pumps and purifies the blood inside the human body. As the heart expands and contracts continuously, this contraction and expansion results in blood circulation throughout the body.
(How the heart circulates blood)
Its location is between the two lungs of the human chest and above the diaphragm. The heart is wide on one side and pointed on the other. The wide end is at the top and the pointed end is at the bottom.
The heart is surrounded by a two-layered pericardium. Between these two layers is pericardial fluid which helps the heart to contract. The human heart has four valves. The upper chamber is called the right and left atrium. And the following ones are called right and left ventricles.
Although the balconies are thin, the ventricles are thick and muscular. The upper veins and the lower veins are connected to the right atrium. Four pulmonary arteries are attached to the left atrium.
The pulmonary artery is connected to the right ventricle and the aorta originates from the left ventricle.
The work of the heart
We know that the heart is constantly contracting and expanding. Through this contraction and expansion, blood flows throughout the body. The contraction and expansion of the heart is called heartbeat.
The heart can contract on its own without any external response. The sum of these repeated heartbeats in the heart is called the cardiac cycle. The blood in our body is moving because the heart is always contracting and expanding. The cardiac cycle is completed in four steps.
Blood circulation system
The contraction of the heart during expansion and contraction of the heart is called systole and the dilation is called diastole.
When the two arteries in the heart are dilated, carbon dioxide-laden blood from the whole body enters the right atrium through the upper and lower arteries, and oxygen-rich blood enters the left atrium through the pulmonary vein. This whole process is called atrial diastole.
Then came the systole of the atrium. Diastole in the atrium causes the heart to contract when the atrium is full of blood, causing carbon-di-oxide-laden right ventricle to move from the right atrium and oxygenated blood from the left atrium to the left atrium.
When the ventricles become bloody, they constrict. At this time the bicuspid and tricuspid valves located in the heart are closed. At this time there is a sound. Which sounds like “profit”. And this time the valve of Semiluna is open.
Then pure blood (O2 blood) from the left ventricle spreads through the aorta throughout the body with various food, nutrients and other essential elements. This is called ventricular systole.
After ventricular systole, ventricular diastole begins. Here is another word. Whose voice is “dub”.
The sound of the heart
Ventricular systole = lab
Ventricular diastole = dab
During the heartbeat
It takes 0.6 seconds for the heart to beat completely. A normal person has a heartbeat 80-100 times per minute. This is called heart-beat.
There is a kind of pressure on the arteries during blood circulation. When blood flows through an artery, it flows in the form of waves. The pressure that builds up in the arteries is called blood pressure. The pressure of the arteries is greatest during the contraction of the heart and the pressure decreases through the expansion of the heart.
According to doctors, the ideal blood pressure of an adult is 120/80. The first is high quality, the second is low quality. The first is systolic pressure. Whose standard value is less than 120. The second is the diastolic pressure whose ideal value is less than 70.
High blood pressure
Another name for it is hypertension. High blood pressure is when the blood pressure rises above a certain level. In Anadar, most people call it high blood pressure. If the systolic pressure rises to 180 or higher and the diastolic pressure rises to 95 or higher during cardiac contraction, this person has high blood pressure.
Anxiety, lack of sleep, agitation, depression, excess salt intake, fat gain, weight gain are some of the causes of hypertension. But it is not yet known why hypertension occurs. It causes a lot of damage to the body. It is one of the leading causes of heart disease.
If it is to remedy or prevent:
1. If you have diabetes, keep it under control
2. Eat less salt.
3. Avoid fatty foods.
4. Getting enough sleep.
5. Stay free from worries
. Exercise regularly.
. Walk at least 30 minutes every day
. Quit smoking.
9. Eat less sugary foods
It is also possible to avoid high blood pressure by following many rules.
With this, the detailed episode of blood came to an end.