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  • A 1st-year respiratory therapy student, Joy, struggles with how the Valves maintain the direction of blood flow, preventing backflow. Since she is late for the class, she does not reach the part of the heart valves in the lesson. So, now she is struggling because they have a recitation tomorrow. But her friend notices how struggling she is.
  • Okay, let me explain how the Valves maintain the direction of blood flow or prevent the backflow.
  • Oh, preventing the backflow?
  • Hi, sis! I know you didn't get into the whole class of sir Park. What can I help you with?
  • Oh, hi, sis. I am struggling with the part of the valve. Like, how the Valves maintain the direction of blood flow.
  • OMG, thank you, sis!
  • Yes, sis.
  • In detail, there are two atrioventricular and semilunar valves that prevent the backward flow of blood. The two atrioventricular valve are the Tricuspid Valve which is situated between the right atrium and right ventricle. And the second is the mitral valve, which is between the left atrium and left ventricle. The two semilunar valves are the pulmonary valve, which is between the right ventricle and the pulmonary artery. And lastly is the aortic valve. It is between the left ventricle and the aorta.
  • During the cardiac cycle, a series of valves called the atrioventricular and semilunar valves open and closed tightly as the heart pumps blood. From that, blood flows only one way through these valves, preventing backflow.
  • Oh, atrioventricular and semilunar valves.
  • The cardiac cycle encompasses all events that occur from the beginning of one heartbeat to the beginning of the next and can be divided into two parts: diastole and systole. They happen as the heart beats, pumping blood through a system of blood vessels to every region of the body.
  • In this cycle, the tricuspid valve is first, followed by the pulmonary valve, mitral valve, and lastly, the aortic valve. The atrioventricular valves open, and the semilunar valves close during the diastole phase of the cardiac cycle. The atrioventricular valves close, and the semilunar valves open during the systole phase.
  • Oh, okay okay.
  • And this is how the Valves keep blood flowing in the right direction and avoid backflow.
  • Also, I may not be able to answer the recitation tomorrow without you.
  • Oh, so that is how the valves prevent the backflow of our blood. Studying science is helpful and informative. Thank you so much, sis! Without you, I can not understand how the heart valves maintain the direction of blood flow.
  • OMG! No need, sis.
  • Because of that, let's go to the canteen! I will treat you.
  • No, sis! Let's goooo!!
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