Human Heart – Structure, function, brackets and valves
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what is human heart
The human heart is protected in a sac called pericardium, its total weight is 375 grams.
It is the busiest part of the body, it beats 72 times in 1 minute and children’s heart beats 102 times in 1 minute, which transports about 500 milliliters of blood to different parts of the body in 1 minute.
The human heart is four axillary, which is located inside the ribs on the left side and inside the fluid. There is a right atrium and a left atrium in the front part and a right ventricle and a left ventricle in the back part of the heart. Between the right atrium and the right ventricle is the Trivalini valve. Between the left atrium and the left ventricle there is a biconcave valve.
picture of human heart
Human heart dynamics and heartbeat
A healthy human heart beats 72 to 75 times in a minute. This rate of pulsation of the heart may be low and may also be high. With each beat, there is a contraction of both the atrium first and then both the ventricles. After contraction, both relax together. This pulsation in the heart goes on continuously for half an hour.
When both ventricles contract while the heart is working, the apex of the heart hits the chest wall. This gives rise to its sound. That is what we hear and feel in the form of heartbeat or pulsation.
The heart rate is faster in children than in adults. Many factors affect the rate of heartbeat. Such as the income of the person, his physical and mental condition etc.
As the age of a person increases, the rate of pulsation of his heart also gradually decreases. In intense emotions such as anger, excessive happiness, etc., the heartbeat becomes very fast.
- It acts like a pump which draws blood in and reaches different parts of the body through arteries.
- The heart collects impure blood from all parts of the body through the upper mahashira and the inferior mahashira in the right atrium.
- When completely filled, there is a constriction in the right atrium and blood flows into the right ventricle.
- After this process the tricuspid valve closes.
- After this, when the right ventricle is compressed, the blood passes through the pulmonary valve and the pulmonary artery further divides into the sub-branches.
- Which are called the left and right pulmonary arteries. The function of these arteries is to carry impure blood to the lungs for purification.
- Purified blood from the lungs is transmitted through the four pulmonary veins to the left atrium of the heart.
- With a blow, the left atrium enters the left ventricle through the ventricular valve. After this the atrio-ventricular valve closes.
- After this the left ventricle contracts due to which pure blood reaches the aorta.
- The aorta performs the function of carrying pure blood to the whole body parts.
It is a pinkish conical hollow fleshy organ from the inside, it is located between the lungs in the thoracic part of the thoracic part of the body.
These blood vessels carry blood throughout the body. And then brings it back from this. Normally, the amount of blood in the human body is 5-6 liters.
According to another belief, the 20th part of the human body is blood. Blood keeps running throughout the body. in the circulatory system mainly in the heart artery and vein plays an important role.
Our heart works like a pumping machine which continuously pumps the impure blood to the lungs and then sends the pure blood to the whole body.
three layers of the heart wall
It is made up of two cells. The outer corpuscle is made up of fibrous tissues and is found internally in continuation of a double layer of serous membrane.
The outer fibrous is in continuation with the large blood of the heart and the tunica adventitia of the corpuscles upstream and is engaged in the diacrame towards the dance.
The outer layer of the serous artefact is called the lateral periphysium. It acts as a lining of the fibrous fundus.
The interstitial pericardium is attached to the cardiac muscle and is in continuation of the lateral pericardium.
It is made up of a specific type of heart muscle. This muscle is found only in the heart. Two fibers are found in it. They belong to the voluntary category.
The thickness of the myocardium is not the same everywhere. It is thickest at the peak and thinner towards the base.
Whereas the left ventricle is thicker because the workload of the left ventricle is more. The myocardium is very thin in the atria.
Endocardium, the innermost layer of the heart wall, is made up of flattened articular cells. The four chambers and valves of the heart are covered by this layer.
It is divided into right and left parts. This is done through the septum on the dividing muscle. Both these right and left parts are completely separate from each other.
The right side of the heart is related to the impure and the left part is related to the exchange of pure blood, the right and left part again divides on the transverse, forming an upper and lower part. In this way the entire inner part of the heart gets divided into four chambers.
Both the chambers on the left side i.e. left atrium and left ventricle are connected with each other through an opening.
Exactly the same type of arrangement is on the left side i.e. right atrium and right lower side, they are also connected with each other by a hole, valves are found on these holes.
These vatavas are engaged in such a way that the blood can go only from the atrium to the ventricles but cannot come back.
The blood vessels carrying and carrying blood also open in their respective cell (chamber).
The heart has the following four brackets
- right atrium: upper chamber on the right
- right ventricle: lower right chamber
- Left atrium: Upper room on the left side.
- Left ventricle: The lower chamber on the left side.
1. Right Atrium
In this part of the heart, the deoxygenated impure blood of the whole body comes and collects. Udhrva mahashira performs the function of carrying impure blood from the upper part of the body and inferior mahavira from the lower part to the right atrium.
The shell of this cell is thinner because it blood Pumping work does not have to be done much. The main function of this chamber is to receive only blood.
2. Right ventricle
The second chamber of the heart is the right ventricle, after the impure blood reaches the right ventricle, it enters the right ventricle through the atria ventricle and from there it goes through the pulmonary arteries to the lungs to be purified.
Note:- Except the pulmonary artery, only pure blood is affected in all other arteries. The veins of the right ventricle are thicker than those of the right atrium because it has to do more of the work of pumping blood.
3. Bye Atrium
The left atrium is the upper left part of the heart. In terms of size, the variable is slightly smaller than the right atrium. Its walls are also slightly thicker than the right atrium. In this, the four pulmonary veins openly carry the work of carrying pure blood to the left atrium.
4. Left ventricle
The fourth chamber of the heart is the left ventricle. It is the lower part and the largest chamber of all the chambers of the heart. Its walls are thicker than all the other chambers.
In this there is a hole called aorta, from which the aorta comes out and serves as a blood supply to various parts of the body.
As the left atrium contracts, pure blood flows into the left ventricle. As the left ventricle is compressed, the pure blood opens the opening of the aorta and through it it is affected.
It is thus clear that the left ventricle plays the most important role in delivering pure blood to all parts of the body.
In fact, there are valves or valves to prevent blood flow in the wrong direction in the heart.
There are mainly four valves in the heart.
- ticspeed valve
- mitral valve
- pulmonary valve
- autical valve
1. Ticspeed Valve
The hole located between the right atrium and the left ventricle, in which the structure is called the atrioventricular orifice, its valve is called the tricuspid or zircoid valve. Three triangle shaped caspases are found in this valve.
These spasms of valves have complete control over the atrioventricular orifices. Due to the contraction in the atrial, the blood pushes the caspases and reaches the ventricles.
Immediately after this process, the caspase is closed and at this very moment due to contraction of capillary capillaries, it exerts a strain on the cardi tendini, as a result the caspase does not go alone into the atrium and blood is not able to return back.
2. Mitral Valve
The valve of the left atrioventricular orifice between the left atrium and the right ventricle is called the bicuspid valve or mitral valve or bicuspid valve.
Due to having two cusps in it, it is called bicuspid valve. Its structure is also similar to that of the tricuspid valve. Its function is to prevent blood from returning to the left atrium when the left ventricle is compressed.
3. Pulmonary Valve
The valve between the right ventricle and the pulmonary artery is called the pulmonary valve or pulmonary valve. It is known with a crescent valve because it has three crescent shaped cusps.
4. Autical Valve
The aortic valve is located between the left ventricle and the aorta. In terms of composition and function, it is similar to the pylonvari valve.
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