The document instructs students to choose 1 of several discussion questions to answer in a post of at least 250 words by Wednesday, with 2 references in APA format. Students must also reply to 2 classmates' discussions by Saturday with replies of at least 100 words each. The question selected asks about the function of the heart and to trace the path of blood from the inferior vena cava to the lungs and then to the aorta, including the valves involved.