Note on Blood

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Circulatory system

Blood circulatory system plays an important role in the body of organisms. Essential nutrient and useful materials need to be transported from one part of the body to the other part of the body. The blood transport these essential nutrients, oxygen and hormones to the different tissues of the body and also transport unwanted and harmful substances produced in the body to the excretory organs. This process continues in the body and is called transportation or circulatory system. In unicellular and simple organisms, the transport system is simple while, in complex organisms, the transport system is well developed. In developed organisms, blood is flowing all the time in blood vessels. So, essential nutrients are carried by the blood to different part of the body and unwanted substances are carried by the blood from tissue to the excretory organs.

Blood

Blood is a red fluid which circulates around the body through blood vessels. Blood is red due to the iron-containing pigments called hemoglobin.Hemoglobin is made up of two parts; heme- iron containing part and glopin- protein part. Blood is composed of plasma and blood cells. Plasma is a yellowish transparent liquid. It contains 90% water and 10%nutritive substances dissolved in water. It also carries the carbon dioxide gas produced during respiration by the lungs. It helps to carry urea from the liver to the kidneys and hormones secreted by the endocrine glands to the tissues.

Blood Cell

There are three types of blood cells in the blood i.e. red blood cells, white blood cells, and platelets. Red blood cells are many in number in the blood. These blood cells are very small and have no nucleus. They are made in bone marrow and destroyed in the spleen. Hemoglobin present in cells absorbs oxygen from the lungs and helps to transport to the different cells of the body. The decrease in the number of red blood cells in the blood causes anemia.

White blood cells are bigger than red blood cells and are less in number in the blood. These cells are of various types and colorless. They have the distinct nucleus but have no fixed shape. They are also made in bone marrow. These cells fight against germs in an infected area and protect the body from disease. Some of them destroy the disease-causing microbes while some of them remove the destroyed cells or microbes from the infected area and help to heal the wounds.

Platelets are very tiny cells. These are smaller than both red blood cells and white blood cells. They are also of various kinds. They are less in number in the blood. They are spherical in shape and have no nucleus. They are also made in bone marrow, they help in clotting of blood at wounds and damaged skin or cut. Thus, platelets play an important role to clot the blood in wounds or cuts.

  • Blood is a red fluid which circulates round the body through blood vessels. Blood is red due to the iron containing pigments called hemoglobin. Blood is composed of plasma and blood cells. Plasma is a yellowish transparent liquid.
  • There are three types of blood cells in the blood i.e. red blood cells, white blood cells and platelets.
  • White blood cells are bigger than red blood cells and are less in number in the blood. 
  • There are three types of blood cells in the blood i.e. red blood cells, white blood cells, and platelets. 
  • Blood is a red fluid which circulates around the body through blood vessels. 
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Very Short Questions

Blood is a fluid composed of plasma and blood cells which flowin our blood vessels. It is the carrier of materials for the transportation inside the body.
Its main functions are:

  • Blood balances the flow and amount of water in the body.
  • It dissolves and transports nutrient obtained from the intestine.

Plasma is the fluid part of the blood which is transparent and pale yellow in color. It consists of about 90% of water and rest is carbohydrates, fats, proteins, minerals and waste materials. Its main functions are:

  • It transports nutrients like glucose and amino acids to cells.
  • It transports urea to kidney for its removal.
  • It transports hormones.
  • It controls amount of water in the blood.

There are two types of blood cells. They are:

  • Red Blood Cells (RBCs)
  • White Blood Cells (WBCs)

They are shapeless, biconcave, non-nucleated structures found in plasma. They contain an iron-rich pigment called hemoglobin.
Its main function is to transport oxygen to different parts of the body.

The irregular shaped, colorless structure present in plasma with nucleus are called white blood cells. They are bigger than RBCs.
The main function of white blood cells is to protect the body from diseases.

The main function of platelets is to help in blood clotting in case of injury or wound in the body.

RBC WBC
They do not contain nucleus They contain nucleus
They contain hemoglobin They do not contain hemoglobin
They are red in color They are colorless
They are smaller They are bigger

Platelets are very tiny cells. These are smaller than both red blood cells and white blood cells. They are also of various kinds. They are less in number in the blood. They are spherical in shape and have no nucleus. They are also made in bone marrow, they help in clotting of bloods at wounds and damaged skin or cut. Thus, platelets play an important role to clot the blood in wounds or cuts.

The decrease in the number of red blood cells in the blood causes anemia. The increase in the number of white blood cells in the blood causesLeukemia.

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  • RBC have ______.

    one nucleus


    no nucleus


    two nucleus


    three nucleus


  • Haemoglobin is found in ______.

    Platelates


    RBC


    Pericardium


    WBC


  • Low number  of WBC is due to ______.

    anemia


    AIDS


    hepatitis


    marasmus


  • Transportation of essential substance and nutrients in higher animals is assisted by ______.

    blood
    limbs
    legs
    tongue
  • The biggest blood cells are ______.

    Plasma


    RBC


    WBC


    Platelates


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