Note on Heart

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The heart is an important organ in our body. It is made up of cardiac muscles. The heart pumps blood from the heart to the different part of the body. The heart supplies oxygenated blood to the cells through blood vessels. The heart also helps to collect deoxygenated blood from different cells, send it to lungs for purification and then transport again to the cells.

The heart is a strong muscular organ. It is situated between two lungs in the thorax. It is enclosed in a membrane called pericardium. The space inside is filled with pericardial fluid which protects the heart from the mechanical jerk.

The heart has four chambers, they are:

  1. Left ventricle
  2. Right ventricle
  3. Right auricle
  4. Left auricle

There are two upper chambers and two lower chambers. The heart is internally divided into the right chamber and left chamber by a thick muscular wall called septum.


Blood vessels

The heart pumps blood through vessels. These vessels carry blood to the different parts of the body. There are three types of blood vessels, they are:

  1. Arteries
  2. Veins
  3. Capillaries

Arteries: The vessels which pump blood through parts of the body are called arteries. Arteries carry oxygenated blood to the body. The wall of arteries is made up of thick muscles and so, it can bear the great pressure of the blood. Arteries have no valves. Arteries divide into branches in different parts called arterioles. Arterioles also branch into smaller capillaries when they reach cells and tissues. These capillaries carry oxygenated blood and dissolved salts and sugar to the cells.

Veins: The vessels which carry blood to the heart are called veins. Veins carry deoxygenated blood to the heart. They have the thinner wall than that of arteries and have valves. Capillaries collect blood from tissues and carry to the heart.

Capillaries: The branched vessels which reach the different tissues of the body are called capillaries. They connect minute vessels like arterioles and venules in the form of network.


Blood circulation

The organs which take part in the circulation of blood are as follow:

  1. Heart
  2. Arteries
  3. Veins
  4. Capillaries

The deoxygenated blood collected from a different part of the body reaches the right auricle of the heart via superior and inferior venacava. The right auricle contracts and the blood flow to the right ventricle. When the right ventricle contracts the blood reaches lungs through the pulmonary artery. In lungs, the blood gets oxygen and leaves carbon dioxide. The oxygenated blood i.e. pure blood is carried by pulmonary vein to the left auricle. When the left auricle becomes full, it contracts and the blood flows to the left ventricle, which is pumped by the heart to the aorta. The aorta carries this oxygenated blood to all parts of the body and the veins carry deoxygenated blood from all over the body. The deoxygenated blood is carried by venules to the veins which carry back to the right auricle of the heart.

  • The heart is an important organ in our body. It is made up of cardiac muscles. The heart pumps blood from the heart to the different part of the body.
  • The heart supplies oxygenated blood to the cells through blood vessels.
  • The heart also helps to collect deoxygenated blood from different cells, send it to lungs for purification and then transport again to the cells.
  • The heart has four chambers, they are Left ventricle, Right ventricle, Right auricle and Left auricle.
  • The heart is a strong muscular organ. It is situated between two lungs in the thorax. It is enclosed in a membrane called pericardium. 
  • The heart is internally divided into the right chamber and left chamber by a thick muscular wall called septum.
  • These capillaries carry oxygenated blood and dissolved salts and sugar to the cells.
  • The deoxygenated blood collected from a different part of the body reaches the right auricle of the heart via superior and inferior venacava. 
.

Very Short Questions

All the living organisms whether they are unicellular or multi-cellular need a transport system to carry useful substances to different parts of the body and to carry waste and harmful substances to the organs from where they can be disposed.

The differences between artery and vein are as follows:

Artery

Vein

They carry oxygenated blood.

They carry deoxygenated blood.

There is no valve in arteries.

There is a valve in veins.

Arteries are elastic in nature.

Veins are inelastic in nature.

They are deep-seated in muscles.

They are superficial in muscle.

The size of the human heart is about 12 cm in length and 9 cm in breadth.

The average weight of the human heart is about 300 grams in adults.

Capillaries are defined as the minute blood vessels which form a network. Arteries end in capillaries and veins start from the capillaries.

The average weight of the human heart is about 300 grams in adults.

The size of the human heart is about 12 cm in length and 9 cm in breadth.

All the living organisms whether they are unicellular or multi-cellular need a transport system to carry useful substances to different parts of the body and to carry waste and harmful substances to the organs from where they can be disposed.

The heart has four chambers. They are:

  1. Left ventricle
  2. Right ventricle
  3. Right auricle
  4. Left auricle

The vessels which carry blood to the heart are called veins. Veins carry deoxygenated blood to the heart. They have thethinner wall than that of arteries and have valves. Capillaries collect blood from tissues and carry to the heart.

The heart is an important organ in our body. It is made up of cardiac muscles. The heart pumps blood from the heart to the different part of the body. The heart supplies oxygenated blood to the cells through blood vessels. The heart also helps to collect deoxygenated blood from different cells, send it to lungs for purification and then transport again to the cells.

The heart has four chambers, they are:

  1. Left ventricle
  2. Right ventricle
  3. Right auricle
  4. Left auricle

There are two upper chambers and two lower chambers. The heart is internally divided into the right chamber and left chamber by a thick muscular wall called septum.

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  • The heart is enclosed in a membrane called ______.

    hemoglobin


    spinal cord


    pericardium


    cardium


  • The heart pumps blood through ______.

    vessels


    WBC


    platelets


    RBC


  • The vessels which supply blood to the different parts of the body are called ______.

    capillaries


    arteries


    aorta


    veins


  • Which one of the following carries deoxygenated blood to the heart?

    Capillaries
    None
    Arteries
    Veins
  • The heart is internally divided into the right chamber and left chamber by a thick muscular wall called ______.

    septum


    valve


    aorta


    auricle


  • The ______ carries this oxygenated blood to all parts of the body and the veins carry deoxygenated blood from all over the body.

    ventricle


    septum


    aorta


    valve


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Heart of shape


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heart of shape


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Bhupesh

Why wall of ventricle is thick?


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smriti

why is heart tilted towards right


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