Mammals are said to have a "double circulatory system". This means

That the blood vessels are paired.

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That there are two types of blood vessels attached to every organ; an artery and a vein.

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That there are two system; one from the heart to the lungs and back to the heart and other to and from rest of the body.

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That the blood circulates twice as quickly.

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Solution

The correct option is C That there are two system; one from the heart to the lungs and back to the heart and other to and from rest of the body.
The mammalian heart has double circulatory system. One system is the heart - lung - heart circulation. It carries deoxygenated blood to lungs for oxygenation. The other system is heart- body- heart circulation. Here, the oxygenated blood reaches the entire body and deoxygenated blood is brought back to the heart.

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Similar questions

Blood vessels taking blood from the lungs to the heart are

Q. Select the incorrect statements.
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV node is known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.

There are two circuits the blood circulates in.

Choose the options that correctly shows the direction of blood in the heart, lungs and body and the type of the circulation. (You may choose more than one option.)

Q. Match the definition to the correct term in the given list.
A thin-walled blood vessel that carries blood from capillaries to the heart.

Vein, cardiac cycle, cardiac output, heart rate, heart beat, double circulation, circulatory system, extracellular fluid, intercellular fluid, myogenic heart, neurogenic heart.

Q. Short / Long type answer type questions.
What is the path of blood flow from the heart to the lungs, back to the heart, from the heart to systemic circulation, and back to the heart again?

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