Which of the following act as a channel of transmission of blood to the heart in the human body?

Which of the following act as a channel of transmission of blood to the heart in the human body? Correct Answer Veins

Veins act as a channel of transmission of blood to the heart in the human body. Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.

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The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
Which among the following carries impure blood to human heart?