Question

The blood circulation in the human heart is called
(a) Triple circulation
(b) Double circulation
(c) Quadruple circulation
(d) Single circulation

Answer 1

Hint: Human heart pumps oxygen and nutrient- rich blood throughout the body to sustain life. The blood travels to the body via two distinct circuits, Pulmonary and Systemic circulation.

Complete step by step answer:
The blood through the human heart passes twice during one complete cycle of the body via the left and right halves carrying oxygenated and deoxygenated blood respectively. Thus, human circulation is known as double circulation.
The human heart is actually two separate pumps. The left side carries out systemic circulation i.e. it pumps blood to the body and the right- side carries out pulmonary circulation i.e. it pumps blood to the lungs (pulmonary circulation) . Each side has an atrium and a ventricle.

The pulmonary veins supply oxygen-rich blood from the lungs to the left atrium. The left ventricle pumps this oxygenated blood into the aorta. Arterial branches from the aorta supply oxygen- rich blood to all the organ systems (except lungs) . The right atrium receives deoxygenated blood returning from the systemic circulation via vena cava. Blood pumps from the right ventricle flow into the pulmonary trunk, that carries deoxygenated blood to the lungs via the pulmonary artery.
The path of the blood from the right ventricle, through the lungs, and back to the left atrium completes one circuit: the pulmonary circulation.
The path of the blood from the left ventricle, through the body, and back to the right atrium completes the second circuit: the systemic circulation.
So, the correct answer is '(b) Double circulation.’

Note:
- Oxygenated blood is carried by a network of arteries, arterioles, and capillaries to the tissue.
- Deoxygenated blood is collected by a network of venules, veins, and vena cava.
- A special coronary system of blood vessels is present in humans exclusively for the circulation of blood to and from the cardiac musculature.