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What are the components of the transport system in human beings? What are the functions of these components?

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The main components of the transport system in human beings are the heart, blood, and blood vessels.

  • Heart pumps oxygenated blood throughout the body. It receives deoxygenated blood from the various body parts and sends this impure blood to the lungs for oxygenation.
  • Blood is a fluid connective tissue, it helps in the transport of oxygen, nutrients, CO2, and nitrogenous wastes.
  • Blood vessels (arteries, veins, and capillaries) carry blood either away from the heart to various organs or from various organs back to the heart.
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The transport system (called circulatory system) in human beings mainly consists of heart, blood and blood vessels.

Functions of component of circulatory system:
(i) Heart: The heart is a muscular organ which pumps blood to the different parts of the body. It receives deoxygenated blood from the body parts and pump it to lungs which enriches it with oxygen. It receives purified blood from lungs and pumps it to all the parts of the body.
(ii) Blood: Blood is fluid connective tissue it consists of a fluid  known as plasma in which the cells are suspended, such as white blood cells and red blood cells. Plasma transports food, carbon dioxide and nitrogenous wastes (urea and uric acid) in dissolved form. Red blood cells transport oxygen. Blood also transport many other substances like hormones, salt etc. Platelets present in the blood stop bleed from injuries by forming blood clots.
(iii) Blood vessels: Blood vessels form a closed network of tubes to reach all the tissues. Thus, the blood pushed by the heart flows in the blood vessels (arteries) and also comes back to the heart in the blood vessels (veins).

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