7) when an experiment is repeated and the new results are different from the original results, what could you assume to be true? a) the results from both experiments are worthless. b) the first experiment's results are worthless and should be discarded. c) the experimental design is flawed and the experiment should be discarded. d) neither test results are 100% reliable and additional experimentation is needed.

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