Question

The blood vascular system of mammals is known as double vascular system because
A. A group of arteries carries oxygenated and other groups of veins conducted deoxygenated blood
B. Oxygenated blood runs from heart to different organs by one set of arteries while deoxygenated blood runs from heart to lung by pulmonary artery.
C. The two different systems never met.
D. All of the above

Answer 1

Hint:- For life, transport networks are critical. For the transport of nutrients and waste elimination, single-cellular species depend on basic diffusion. More complex circulatory mechanisms have been produced by multicellular animals.

Complete answer: In birds and rodents, double circulation pathways are observed. Animals in this type of circulatory system have a four-chambered heart. The body deoxygenated the right atrium, and it is returned to the lungs to be oxygenated by the right ventricle. The left atrium gets oxygenated blood from the lungs and it is transferred to the rest of the body by the left ventricle. Many animals have this type of circulatory system, including humans.
Since they consist of two circuits, referred to as the pulmonary and systemic circulatory systems, these circulatory systems are called 'double' circulatory systems. The pulmonary circulatory system consists of blood vessels which, from the heart to the lungs, transport deoxygenated blood and return oxygenated blood to the heart from the lungs.Blood arteries in the systemic circulatory system transport oxygenated blood to different organs in the body from the heart and return deoxygenated blood to the heart.

Deoxygenated blood exits the heart from the right ventricle of the pulmonary circulation system and is transferred by the pulmonary artery to the lungs. The only artery that contains deoxygenated blood is the pulmonary artery. It takes blood to the capillaries where it diffuses carbon dioxide through the alveoli (lung cells) out of the blood and then into the lungs, where it is exhaled. Oxygen diffuses through the alveoli at the same time and then reaches the blood and is transferred by the pulmonary vein to the left atrium of the heart.

Systemic circulation refers to the portion of the circulation system that exits the heart, holds the cells of the body with oxygenated blood, and returns the heart to deoxygenated blood. Blood goes into the aorta, the main artery of the body, from the left ventricle. The aorta connects to smaller arteries feeding all of the body's organs. At the end, these arteries branch into capillaries. Oxygen diffuses from the blood into the cells of the capillaries, and waste and carbon dioxide diffuse from the cells and into the blood. In capillaries, deoxygenated blood then passes into venules which converge into veins, and the blood is transported back to the heart. These veins, namely the superior vena cava and the inferior vena cava, converge into two main veins.

So from these discussions we can conclude that option (A), (B) and (C) are the correct answer. Therefore option (D) All of the above are correct answers.

Note:- There is a four-chambered heart in humans, reptiles, and rodents. Fish have a heart of two chambers, one atrium and one ventricle. With two atria and one ventricle, amphibians have a three-chambered nucleus. The value of a four-chambered heart is that the oxygenated and deoxygenated blood is not a combination.