Question

circulatory system full explain...
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Answer 1

Answer:

When the uni cellular organisms separated themselves from the sea with the formation of the limiting membrane, the problem of transportation arose. The nature has found the solution, by creating a microscopic ocean which has its own currents.

In unicellular organisms like ameoba the protoplasm shows natural movements. These movements are called brownian movements, because of which the nutrients and oxygen are distributed throughout the protoplasm equally.

Answer 2

Answer:

The main transport system in human beings is the circulatory system which also known as blood circulatory system. In circulatory system, blood carries digested food, water and oxygen to all the parts of the body. It also takes away the waste products like carbon dioxide made in the body cells. Heart, blood vessel and blood are some parts of human circulatory system.

I hope its helps you........