heart

• what tissue does the heart mainly consist of?

  muscular tissue
• how blood flows in the heart?

  1. blood enters the left atrium and then the right atrium
  2. atria contracts and forced blood to flow to the ventricles
  3. ventricles contract and force blood out of the heart
  4. valves stop the blood from flowing backwards into the atria when the ventricles contract
• which side of the heart contains the thicker muscular wall?

  Left