All about the heart!
http://www.zunal.com/webquest.php?w=22282
The heart is the hardest working organ in your body;
it is what keeps you alive! It is comprised of cardiac muscle,
arteries, veins, and valves.
http://www.ynhh.org/heart-and-vascular-center/heart_works.aspx?source=/cardiac/heart/index.html
Where does the blood go?
Your heart is electric!
The heart has its very own electricity system that tells it how fast and when to beat. A small piece in the right atrium called the sino atrial node (SA node) is like a built in pacemaker. It sends electrical impulses through the heart to let it know when to beat. Normally, your heart could beat between 60 and 100 times a minute! Some people, like athletes, can have a resting heart rate down in the 50's. The SA node shoots its electrical impulses down to the atrioventricular node (AV node) which completes the heartbeat.
Fun Fact:
Many people think that arteries only carry oxygenated blood and veins only carry deoxygenated blood. This is not entirely true! There is one exception to each, the pulmonary vein carries oxygenated blood back to the heart and the pulmonary artery carries deoxygenated blood to the lungs for oxygenation. The best way to remember the difference between arteries and vein is simply that arteries always carry blood away from the heart and veins always bring blood back to the heart.
Where does the blood go?
Blood is pumped from the body into
the right atrium, from there it enters the right ventricle. It is then
pumped through the pulmonary artery to the lungs for some oxygenation!
Once oxygenated, the blood is sent back to the heart via the pulmonary
vein into the left atrium. It makes its way on down to the left
ventricle, which is the strongest and most muscular portion of the
heart, and is pumped back out to the body.
Your heart is electric!
The heart has its very own electricity system that tells it how fast and when to beat. A small piece in the right atrium called the sino atrial node (SA node) is like a built in pacemaker. It sends electrical impulses through the heart to let it know when to beat. Normally, your heart could beat between 60 and 100 times a minute! Some people, like athletes, can have a resting heart rate down in the 50's. The SA node shoots its electrical impulses down to the atrioventricular node (AV node) which completes the heartbeat.
Fun Fact:
Many people think that arteries only carry oxygenated blood and veins only carry deoxygenated blood. This is not entirely true! There is one exception to each, the pulmonary vein carries oxygenated blood back to the heart and the pulmonary artery carries deoxygenated blood to the lungs for oxygenation. The best way to remember the difference between arteries and vein is simply that arteries always carry blood away from the heart and veins always bring blood back to the heart.