Yexel Exams - Four valves maintain the unidirectional flow of blood through the heart. The valves are located between the atria and ventricles and in the two arteries that empty blood from
![Heart Valves (Atrioventricular and Semilunar) Heart Valves | Physiology | Lecturio Nursing - YouTube Heart Valves (Atrioventricular and Semilunar) Heart Valves | Physiology | Lecturio Nursing - YouTube](https://i.ytimg.com/vi/UpeUjgmxOjA/maxresdefault.jpg)
Heart Valves (Atrioventricular and Semilunar) Heart Valves | Physiology | Lecturio Nursing - YouTube
![The left and right atrioventricular valve open when ______. (a) the atria begin to contract (b) the ventricles begin to contract (c) the pressure in the atria is greater than that of The left and right atrioventricular valve open when ______. (a) the atria begin to contract (b) the ventricles begin to contract (c) the pressure in the atria is greater than that of](https://homework.study.com/cimages/multimages/16/heart_valves4927298643072342838.jpg)