4+The+heart

The Heart [|The human heart] [|Drawing the human heart]. [|CAM-studio] [|Windows Movie Maker] [|Windows Media Encoder] __What is the heat used for?__ The [|heart] is used for pumping [|blood] around the body. __How does the heart move blood?__ The heart is a giant muscle. It fills up with blood, and then contracts, pushing the blood out. __What is a__ [|heart attack] __?__ A heart attack is the leading reason for both men and women to die. It happens when the coronary artery gets clogged, this stops blood supply to the heart, causing hear cells to die. The temporary stop of blood supply to the brain causes brain cells to die, usually leaving the person in a bad menal state, some people need to re-learn speaking after such an event, or sometimes even how to control their muscles.media type="file" key="HyperHeart1.swf" align="right" width="539" height="357" __What is the Pacemaker?__ The pacemaker is a bundle of cells that tells the heart when to beat. These cells are connected to the rest of the cells of the heart and communicate using electrical signals. The pacemaker sets the pace of the heat (beat). A pacemaker can also refer to an electrical device put inside people with heart problems. It simulates the action of the pacemaker cells. Interestingly, old pacemakers were often nuclear-powered. __How can the Hear keep pumping without getting tired?__ The muscles of the heart are, as opposed to the mucles in your arm, for example, cardiac muscles. This means that they have more volume of mitochondria, usually about 30 to 35%. Like that they have more 'backup energy'. __How does the Heart get energy?__ The heart supplies itself with blood from the right coronary [|artery]. This artery also supplies the right atrium, the right ventricle and the bottom portion of both ventricles. __Why are there two parts of the heart?__ The heart consists of two sides, the left side and the right side. On the left side, oxygenated blood is being pumped, while on the right side deoxygenated blood is pumped. The oxygenated blood is getting pumped to the tissues, the dexoygenated blood goes to the lungs. __What does the Atrium do?__ The Atrium recieves blood coing from the lung. It has thin walls as it only needs to pump the blood to the ventrices. Have a look at the animation above, the atrium and the ventricles are shown there.
 * The Heart**
 * ~ Heart from the outside ||~ Inside of the Heart ||
 * [[image:http://blackbyte.homelinux.org/files/files/School/heart%20diar.png width="353" height="280"]] || [[image:http://faculty.washington.edu/kepeter/119/images/human_heart.jpg width="167" height="336" caption="http://faculty.washington.edu/"]] ||
 * Key Parts of the Heart**

__How to draw a Heart__ You need to watch this vido at home. It gets blocked by unis for some reason! media type="custom" key="6296751" width="435" height="256"