Why is it important that we know how the heart worked and how blood flowed?

. Blood carries oxygen and other important nutrients that all body organs need to stay ... Blood flows through your heart and lungs in four steps: ... When your heart functions normally, all four chambers work together in a ... be able to relax enough so that it can fill with blood properly before it pumps again.

Explanation:

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

this is not a question its simply asking you to read and write a few sentences and   the question on the bottom its fairly easy, you can do this!