Patient Data Exhibits Drag from Word Choices to complete the sentence. Heart sounds are loudest for S1 at the dropdown and for S2 at the dropdown

S1 (first heart sound): The S1 sound, produced by the closure of the mitral and tricuspid valves, is best heard at the apex of the heart. This is because the apex is closer to the location of these valves, making the sound more prominent there. S2 (second heart sound): The S2 sound, produced by the closure of the aortic and pulmonary valves, is best heard at the base of the heart. The base is where the aortic and pulmonary valves are located, so the sound from their closure is more pronounced here.