Final answer:
The NP mnemonic 'MOTIVATED APPLES' does not directly apply to any of the provided options, yet S1 (systole) and the mitral and tricuspid valve closures are associated with the S1 heart sound during systole.
Step-by-step explanation:
The NP used the mnemonic MOTIVATED APPLES for all of the following except S1 (systole). S1 represents the closure of the mitral and tricuspid valves, which are the atrioventricular valves, during the phase of the cardiac cycle known as systole when the heart contracts. The options provided relate to various events in the cardiac cycle; however, none of them directly corresponds to the mnemonic provided. It is worth noting the closure of the mitral and tricuspid valves is indeed associated with the S1 heart sound, commonly heard during systole. The description of events in the cardiac cycle and the specific functions of valves and nodes such as the sinoatrial node, atrioventricular node, and the bundle of His provide context to the question but do not relate to the mnemonic.