Heart

yes, blood from the left left atirum will leave the heart through the aorta to the body.

Right ventricals

Only in women or prepubecent boys. In men with heart problems, it makes them far worse (since the blood's going elsewhere the heart does not get enough, so it can cause a heart attack).

normally no. from the time of birth on it is the stimulus for growth,

however in old age you can have failure even at rest

or you can have severe failure ... both can lead to death, quite rapidly.

The heart does NOT sit in the center of the chest. It actually sits mostly behind your left nipple, but the heart is slightly tilted so a bit is toward the center. However, many things can cause a sharp pain or pains in the chest cavity. One is heartburn. Another is gas pain that radiates upward. A nerve in the ribcage, or even a muscle strain can hurt near or around the heart. These are usually pains that come and go.

If you are over 30 to 40 years old, or older, you should have your doctor check your heart. If you are younger than 30 and play sports, or are overweight, have your doctor check you over.

A heartrate monitor. Many of them come with a strap that goes along the chest.

De oxygenated blood enters the heart through the superior and inferior vena cavas. The blood enters the right atrium. It is then pumped into the right ventricle. There is a valve known as the tricuspid valve that separates these two chambers. The blood is then pumped from the right ventricle into the pulmonary arteries. These arteries carry the blood to the lungs.

They prevent a slight bit of "cushion" to the heart, but no real structural protection. The ribs/rib cage provide the bulk of the protection to the heart (and the lungs, for that matter).

Because the lungs are soft, they cannot stop any significant penetration to the body that might hit the heart, whereas the ribs can provide this function, to an extent.

More times than not, the lungs can actually cause issues for the heart due to a build up of blood or air.

The cardiac sphincter is located at the top of the stomach and controls the direction of food passing through the esophagus so that no food will re enter the esophagus. The Pyloric sphincter stops bile and digested food from entering the stomach, this valve is located at the bottom of the stomach.

heart attack

This condition is called as mitral regurgitation. Here some of the blood flows back to left atrium. So the left atrium gets dilated and there is also hypertrophy of the left ventricle. The efficacy of the heart is adversely affected. There is diminished cardiac out put. In severe cases, you have left sided heart failure.

The heart is in the thoracic cavity in a part called the mediastinum. It is protected by the pericardium, a membranous sac that surround the heart. The mediastinum is that space in the thoracic cavity between the lungs that contains the heart. It also contains the aorta, esophagus, trachea and thymus.
The pleural cavity is the space in the chest between the lungs.

The heart has four chambers to it, the top two which are pumping oxygenated blood out to the rest of the body, while the bottom two are "sucking" (if you will) the blood back into the heart so it can be re oxygenated.

The structure of the leg muscle is similar to the heart muscle in their makeup. There are studies that have shown that leg muscles can be injected into the heart.

Yes they can. It happens very rarely though.

It is the right atrium.

http://www.enchantedlearning.com/subjects/anatomy/heart/labelinterior/glossary.shtml

"The heart is a fist-sized, muscular organ that pumps blood through the body. Oxygen-poor blood enters the right atrium of the heart (via veins called the inferior vena cava and the superior vena cava). The blood is then pumped into the right ventricle and then through the pulmonary artery to the lungs, where the blood is enriched with oxygen (and loses carbon dioxide). The oxygen-rich (oxygenated) blood is then carried back to the left atrium of the heart via the pulmonary vein. The blood is then pumped to the left ventricle, then the blood is pumped through the aorta and to the rest of the body."

http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_anatomy.html

"The ventricle on the right side of your heart pumps blood from your heart to your lungs. When you breathe air in, oxygen passes from your lungs through your blood vessels and into your blood. Carbon dioxide, a waste product, is passed from your blood through blood vessels to your lungs and is removed from your body when you breathe out."

http://kidshealth.org/kid/htbw/heart.html

"Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body."

The arteries and veins are the tubes that are connected to the heart. Arteries carry blood away from the heart, and veins carry blood to the heart.

The heart has four chambers, the right and left atriums and the right and left ventricles. The artiums fill with the blood arriving from the body. The ventricles pump the blood out. The right ventricle pumps de-oxygenated blood to the lungs while the left ventricle pumps oxygenated blood to the rest of the body.

It forms the central canal of the spinal cord and protects the brain from trauma.

The pulmonary circuit is powered by the right side of the heart. Its main function is to pump deoxygenated blood which has returned to the heart from the body to the lungs, then back to the heart. The blood is pumped from the heart via the pulmonary artery. The blood is then oxygenated by gas exchange between the alveoli in the lungs and the pulmonary capillaries. The newly oxygenated blood is then returned to the heart by the pulmonary veins, ready to be sent round the body.