purpose of the four heart valves

Choose 1 of the following questions to answer by day 3 (Wednesday) and include 2 references (in APA format). Your post should be at least 250 words. Please remember to answer to 2 of your classmates’ discussions (on 2 separate days) by Saturday.  The reply to your classmates should be at least 100 words each.  The references are not included in the word count!

Discussion Question (DQ) 1

Please explain the purpose of the four heart valves, and describe their structure and locations of four heart valves .


Discussion Question (DQ) 2

What is the function of the heart? Please trace a drop of blood from the inferior vena cava (IVC) to the lungs and then from the lungs to the aorta. (Do not forget to include the valves).