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(a) What is meant by human circulatory system ? Name the organs of the circulatory system in humans.
(b) Draw a diagram of the human heart and label its parts.
(c) What is meant by the terms 'single circulation' and 'double circulation' ?
(a) The human circulatory system is responsible for the transport of materials inside the human body.
The organs of the circulatory system are the heart, arteries, veins, and capillaries.
(b) Given below is an image of the human heart with its main parts.
(c) Single circulation: The circulatory system in which the blood passes through the heart only once in one complete cycle is known as single circulation.
Example: It is commonly seen in fishes.
Double circulation: The circulatory system in which the blood travels twice through the heart in one complete cycle is known as double circulation.
Example: It is commonly seen in amphibians, reptiles, birds, and mammals.
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