What describes each hydrogen bond? A
An attraction between positive ends of two molecules
B
An attraction between the positive end of one molecule and the neg
С
An attraction between neutral ends of two molecules
D
An attraction between negative ends of two molecules

1. beginning with all chambers of the heart in the "relaxed" phase, describe the cardiac cycle in mammals, with systole and diastole of the atria and ventricles. for each time point in the cycle you select, state the following: • whether the atria and ventricles are contracting or relaxing • whether the av valves and semilunar valves are closed or open • whether the pressure in the atria and ventricles is high or low