Question -
Answer -
Double circulation, asthe name suggests, is where the blood circulates twice in the heart. Doublecirculation is possible as the heart is divided into four chambers, the rightand the left halves by the atrio-ventricular septum.
The two circulationsare:
- Pulmonary circulation
- Blood in the right ventricle is pumped into the pulmonary arteries
- For oxygenation, these pulmonary arteries transport deoxygenated blood to the lungs
- The oxygenated blood is then sent to the left atrium from the lungs through the pulmonary veins
- This type of circulation of blood is referred to as pulmonary circulation where blood is pumped via pulmonary blood vessels.
- Systemic circulation
- It is a term used to refer to the major circulation of the body
- Oxygenated blood is pumped from the left ventricle into the aorta
- Furthermore, it is carried by the arteries, arterioles and the linkage of blood capillaries
- Simultaneously, deoxygenated blood is accumulated in the right atrium through the inferior and superior vena cava
- This circulation supplies nutrients and oxygen and carries away carbon dioxide and other toxic substances for elimination
Importance of doublecirculation:
- This type of circulation checks and prevents the mixing of oxygenated and deoxygenated blood
- In double circulation, oxygen is utilized efficiently