In human beings the same blood passes twice through the heart for completing one cycle. Since the blood flows twice through the heart so it is called double circulation. The double circulation has two components. These are:
The circulation of blood between the heart and the lungs is called pulmonary circulation.
The circulation of blood between the heart and all the parts of the body except lungs is called systemic circulation.
Test Your Understanding and Answer These Questions:
- Write names of two components of double circulation.
- What is the meaning of the term “double circulation”. Explain its components.