Multiple choice

Valves are not found in _______.

  1. arteries

  2. heart

  3. veins

  4. lymphatic vessels

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arteries generally do not have valves because the high pressure of blood pumped from the heart is sufficient to keep it flowing in one direction. In contrast, veins, the heart chambers, and lymphatic vessels contain valves to prevent the backflow of fluid under lower pressure conditions.

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