Blood and Vessels

•    Cells are the building blocks of the body. Tissues are organisation of similar types of cells that perform a specialised function.

•    Blood is a type of connective tissue that connects various tissues and organs. Blood circulates continuously in the body and is an important part of our circulatory system.

•    Some important functions of blood are:
•    It transports nutrients and wastes.
•    It transports oxygen and carbon dioxide.
•    It provides immunity.
•    It maintains body temperature.
•    It maintainswater balance in body tissues.
•    Circulatory system is a transportation system in animals and humans, which carries food, oxygen and removes harmful wastes.
•    Blood is the main part of thistransportation system. 5.5 litres of blood is present in an adult human body.
•    It consists of plasma, RBCs, WBCs and platelets. There are three types of blood vessels, which includeartery, vein and capillary.
•    Arteries usually carry the oxygenated blood. The only exception to this is the pulmonary artery that carries deoxygenated blood to the lungs.
•    Aorta is the largest artery in the body and carries oxygenated blood to rest of the body.
•    Coronary arteriessupply blood to the heart muscle.
•    Veins are thin walled vessels, which are responsible to carry deoxygenated blood from different parts of the body to the heart. The only exception to this is the pulmonary vein that carries oxygenated blood from the lungs.
•    Coronary veins receive blood from the heart wall and empty it into the coronary sinus.
•    Superior and inferior vena cava are the largest veins in the body.
•    Capillaries are the narrow blood vessels that are responsible for the gaseous exchange along with the exchange of nutrients and wastes between the blood and the body cells.
•    Blood clotting is a complex process that prevents the loss of blood by forming a clot at the site of injury.

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  • Q1

    Name the blood vessels where arteries and veins join.


    Arteries and veins are joined by the capillaries.

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  • Q2

    What is blood?


    Blood is a connective tissue consisting of a fluid matrix, plasma, and formed elements.

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  • Q3

    State the role of haemoglobin.


    Haemoglobin transports oxygen from the lungs to the rest of the body, where it releases the oxygen, so that it can be used by the cells.

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  • Q4

    “Veins never carry oxygenated blood”. State true or false with one suitable example.


    False, pulmonary vein carries oxygenated blood.

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  • Q5

    From where do blood cells receive oxygen?


    The blood cells receive oxygen from the lungs.

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