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प्रश्न
What does the term “double circulation” mean?
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उत्तर
Blood flows twice in the heart before it completes one full round. The full round thus includes
pulmonary and systemic circulation. In pulmonary circulation, blood enters the lungs through
pulmonary arteries. Pulmonary veins collect the blood from the lungs and carry it back to the
left atrium.
In systemic circulation, blood from the left ventricle enters the aorta through which the blood is
sent to the body parts. From the body parts blood is collected by veins and sent back to the heart.
Therefore, the blood circulation in the human body is called double circulation.
संबंधित प्रश्न
Give appropriate biological or technical terms for the following
The relaxation phase of the heart.
The valve which prevents back flow of blood in the veins and lymph vessels ______.
Why does the left ventricle possess a thicker wall than the right ventricle?
Why is circulatory system also known as transport system?
Differentiate between:
Red blood cells and White blood cells
Draw well labeled diagrams of part Artery and Superior vena cava to show the structural.
Match the following.
| Group A | Group B |
| (1) Lungs | (a) Circulation |
| (2) Stomach | (b) Respiration |
| (3) Heart | (c) Co-ordination |
| (4) Brain | (d) Digestion |
Which of the following cells are produced from reticulocytes?
Hematocrit is ______.
The valve which prevents back flow of blood in the veins and lymph vessels is ______.
