The Circulatory System
- The circulatory system is the system of transportation in animals .
- It consists of your heart, blood, veins, and arteries. It carries blood to every part of the body.
- The circulatory system delivers nutrients and oxygen to every cell in the body.
- It also transports waste products such as carbon dioxide.
- Animals have a transport system that delivers nutrients and oxygen to every part of the body.
- It also carries waste products such as carbon dioxide to organs from where they can be removed from the body.
Double Circulatory System
- Humans and other mammals have a double circulatory system. This means that blood passes through the heart twice in one complete circuit.
- The Heart pumps deoxygenated blood to the lungs.
- Here the blood picks up oxygen before returning to the heart.
The heart pumps oxygenated blood at a higher pressure to the rest of the body, and deoxygenated blood returns to the heart.
Why is Blood Circulation in the Human Heart called Double Circulation ?
In Human Beings Blood flows twice in the Heart before it completes one full round that’s why it is called as Double Circulation.
The Two Cycles of Double Circulation are
- The Short Pulmonary (Lung) Circulation and
- The Long Systemic (General Body) Circulation.
For this reason the blood circulation in the human body is called Double Circulation.
The Short Pulmonary (Lung) Circulation
- The pulmonary circulation pertains to the lungs.
- It starts in the pulmonary artery arising from the right ventricle which soon divides into two branches that enter the respective lungs.
- Pulmonary veins collect the oxygenated blood from the lungs and carry it back to the left auricle of the heart.
The Long Systemic (General Body) Circulation
- The systemic circulation pertains to the major circulation in the body.
- It starts with the aorta that arises from the left ventricle.
- The aorta arches back and continues behind as the dorsal aorta.
- The aorta sends blood through arteries to various body parts and their tissues.
- From there the blood is collected by veins and poured back into the heart.