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).
Then they close, so the blood cannot flow backwards into the atria. With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.