Multiple choice

Which of the following statement is not true for heart?

  1. It is surrounded by pericardium containing fluid.

  2. It is made up of specialized muscles.

  3. The two lower chambers are called ventricles which pump blood away from heart.

  4. The two upper chambers are called atria which have thick walls.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Atria have thin walls while ventricles have thick walls.

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