Multiple choice

Which of the following statements is true about veins?

  1. They are empty after the death of the animal.

  2. They do not collapse even after being cut.

  3. Their walls are thin and contain valves.

  4. Their blood flow is fast and intermittent.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

They have valves to prevent the back flow of blood.

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