Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Answer:
Look up cancer and see what it does to your immune system...
Explanation:
YOU pulled a ligament maybe
Answer:
cough, fever, body aches
Explanation:
early symptoms are similar to flu symptoms. this contributes to its multiplication because most don't realize the symptoms are as serious as they are--considering they're so similiar to common illnesses.
