Question

Choose the correct answer from the alternatives given.
The flow of blood out of the ventricles is regulated by:

• A. opening of the atrioventricular valves
• B. ventricular walls contracting
• C. opening of the semilunar valves
• D. more than one of the above

Answer 1

The correct option is D more than one of the above

• The blood flows out of the ventricles with the simultaneous closing of bicuspid and Tricuspid valves to prevent any backflow.
  
• The semi-lunar valves open inorder for the ventricles to pump blood into the systemic aorta and pulmonary artery.
  
• The force required for outflow is obtained by walls of ventricles contracting, composed of specialized muscular tissue myocardium.
  

So, the correct option is 'More than one of the above'.