What I Know about the Cardiovascular Sytem in my head

• The heart needs exercise  to get strong 
• the blood circulates around the body by the heart pumping 
• if you get a heart attack its because a chunk of fat has clogged up a valve so the blood cant get through
• to keep your heart in good condition exercise up too once a day
• your heart is in the middle of of your chest but is stronger on the left side 
• a good way too keep a good cardiovascular system is play a fun game which needs good exercise
• frights also gets your heart rate up
• if you exercise more and more and get your breathing rate up more often it will get easyer and easyer
• if you eat healthy food  it is much easyer to maintain a strong cardiovascular  system