For this discussion post, select one specific topic that you have learned about while studying the cardiovascular system or lymphatic system and compare that topic to a concrete

For this discussion post, select one specific topic that you have learned about while studying the  cardiovascular system or lymphatic system and compare that topic to a concrete, real-life situation or scenario. You must describe this analogy in detail, with a minimum of five complete sentences.  After you have posted your reply, you must respond to one other post that has been submitted by a classmate. Your response to the classmate's post must be at least three complete sentences, and the content should be more than just agreeing or disagreeing with  what the  classmate has written. Note that you will not see the posts of your classmates until you have first submitted your own post.