heart valves Flashcards
what ensures that blood flows one direction ONLY through the heart
the atrio-ventricular valves (tricuspid and bicuspid) and the semi lunar valve.
why do valves open and close
due to pressure differences on either side of the valve
where are the atrio ventricular valve
between the atria and ventricles
what is the function of atrio ventricular valve
prevent backflow of blood from ventricles to atria during ventricular systole (ventricles contracting)
what happens when the atrioventricular valve opens
greater pressure in atria then ventricles
what happens when atrio ventricular valve closes
greater pressure in ventricles than atria
what is the name of the AV valve on the right side of the heart
tricuspid
what is the name of the AV valve on the left side of the heart
bicuspid
where is the semi-lunar valve
these valves are at the base of the arteries leaving the heart
what is the function of the semi lunar valve
prevent blood from returning to the ventricle during diastole (heart at rest)
what happens when semi lunar valve opens
greater pressure in ventricle than arteries (pulmonary and arteries)
what happens when semi lunar valve closes
greater pressure in arteries than ventricles
