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).
When the ventricles finish contracting and begin to relax, the aortic and pulmonic valves snap shut. These valves prevent blood from flowing back into the ventricles. This pattern is repeated over and over, causing blood to flow continuously to the heart, lungs and body.