Blood Vessels and Circulation Quiz
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Questions and Answers

What is the main function of veins in the blood vessel network?

  • To distribute blood to different organs and collect waste substances from them
  • To transport oxygen-rich blood from the heart to all parts of the body
  • To branch out into smaller capillaries and form arteries
  • To collect waste substances from the organs and transport blood back to the heart (correct)

    • What is the function of capillaries in the blood vessel network?

  • To distribute blood to different organs and collect waste substances from them (correct)
  • To transport oxygen-deficient and carbon dioxide-rich blood back to the heart
  • To carry oxygen-rich blood from the heart to all parts of the body
  • To form veins that collect waste substances from the organs

    • Why do arteries have thick elastic walls?

  • To carry oxygen-deficient blood to the heart
  • To withstand the high pressure of blood flow (correct)
  • To prevent backflow of blood
  • To allow the branching out into smaller capillaries

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