Multiple choice

_______ prevents the backflow of blood in heart.

  1. Septa

  2. Valves

  3. Arteries

  4. Veins

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

Valves in the heart, such as the tricuspid, bicuspid, and semilunar valves, ensure that blood flows in only one direction. They open to allow blood to pass from one chamber to another or into an artery and snap shut to prevent backflow when the heart contracts. Septa are walls that separate the chambers but do not prevent backflow.

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