To read aloud the LISP form (DEFUN FOO (X) (PLUS X 1)) one might say: âOpen defun foo, open eks close, open, plus eks one, close close.â Suggested Resources (0.00 / 0 votes) Rate this definition: open
The valve(s) does not close completely, causing the blood to flow backward through the valve. This results in leakage of blood back back into the atria from the ventricles (in the case of the mitral and tricuspid valves) or leakage of blood back into the ventricles (in the case of the aortic and pulmonary valves). stenosis (or narrowing of the valve).
The atrioventricular (AV) valves close when the ventricles contract when the blood pushes against the bottom of the AV valves as the blood is force upwards. Remember from last weekâs lab, ventricular contractions begin at the base of the ventricles. The semilunar valves have a âcup-likeâ shape on the arterial side.