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Heart

            
              Description: Your heart is about the size of your fist. It is shaped like an upside-down pear. The heart is a muscle; it acts like a small pump. This pump is divided into four cavities, two of them are called atria and the other two are called ventricles. The left side of the heart houses one atrium and one ventricle. The right is the same. The smooth inside lining of the heart is the endocardium. The middle of the heart is called myocardium. And the fluid filled sac that surrounds the myocardium is the pericardium.
              Location: If you were to take your fist and put it in the middle of your chest that would be about where you heart is located.
              How it Works: All blood enters the heart through the right side of the heart. And is collected in the right atrium. When the right atrium contracts the blood flows through the tricuspid valve into the right ventricle. From there the right ventricle contracts pushing the blood out of the heart and to the lungs to pick up oxygen. The blood then goes into the left atrium. Then from there the left atrium contracts sending the blood through the mitral valve and into the left ventricle. This is the strongest muscle in your heart, because it has to pump all your blood all the way around your body and back up to your heart! Where it will start the cycle over again.
              Diseases: In 1997 heart disease was the leading cause of death for Americans. Nearly 31% of all deaths were caused by heart diseases.
            
             • Coronary Heart Disease: It is the most common heart disease in the US today. It starts out by a fat build up in the vein. Then it will suddenly rupture causing a scab to form, which will block all blood from getting through the vein. Which will cause the person to have a heart attack.
            
             • Arrhythmia: Arrhythmia is any type of irregular heart beat. Sometimes the heart will skip a beat, or it might be a continuous slow or fast heart rate.


Essays Related to Heart

1. The Heart

THE HEART The heart is one of the most vital organs in the body. ... First, it keeps the heart contained in the chest cavity, second, it prevents the heart from over-expanding when blood volume increases, and third, limits heart motion. ... "# It provides an outer protective layer for the heart, keeps the heart contained in the chest cavity, and Prevents the heart from over-expanding when blood volume increases. ... Another disease or malfunction of the heart is, congestive heart failure (CHF), or heart failure, which is a condition in which the heart cannot pump enough blood to the bodies ...

  • Word Count: 1235
  • Approx Pages: 5

2. heart

HEART The human heart is a specialized, four-chambered muscle that maintains BLOOD flow in the CIRCULATORY SYSTEM. ... Since heart attacks are the number-one cause of death in the United States, the heart gets a great deal of attention. ... STRUCTURE AND FUNCTION OF THE HUMAN HEART The heart's wall has three parts. ... The output of the heart is expressed as the amount of blood pumped out of the heart each minute: the heart minute-volume (HMV). ... EVOLUTION OF THE HEART The hearts of primitive vertebrates apparently had only one atrium and one ventricle. ...

  • Word Count: 1823
  • Approx Pages: 7
  • Grade Level: High School

3. Heart Disease

Each year thousands of people die from coronary heart disease. ... My husband 34 years of age, nearly died of heart attack. ... There are many factors that lead to heart attack. ... Heart disease is a silent killer. ... Taking care of your self will reduce heart disease. ...

  • Word Count: 604
  • Approx Pages: 2
  • Grade Level: High School

4. effects on heart

Parasympathetic innervation of the heart originates in the Medulla Oblongata and travels via the Vagus nerve to the heart, where it splits into two sides of innervation. ... Sympathetic innervation of the heart serves to speed up the heart and increase the stroke volume. ... Marey's law of the heart describes the fact that an inverse relationship exists between arterial blood pressure and heart rate. ... If the right side of the heart is suitably distended by and increased pressure the heart elicits a tachycardic response to increase the cardiac output. ... Hypothyroidism has the opposite...

  • Word Count: 1504
  • Approx Pages: 6
  • Grade Level: Undergraduate

5. Heart Disease

The primary prevention is designed to help patients manage their hearts before a heart attack by eliminating smoking, controlling blood pressure, eating a healthy diet, and exercising. Next, a secondary prevention method helps those already diagnosed with heart problems such as coronary heart disease, cerebrovascular disease, and peripheral vascular disease. ... However, it has been suggested that taking aspirin may reduce the severity of a heart attack and aid in thinning the blood, which could prevent blood clot forming in the arteries of the heart. ... It has been noted that "regular con...

  • Word Count: 555
  • Approx Pages: 2
  • Has Bibliography
  • Grade Level: Undergraduate

6. Heart Attack

All muscles in the heart require oxygen to operate correctly. ... When the heart cannot get oxygen, the heart muscle is damaged and heart attacks occur. A heart attack is also known as a myocardial infraction. ... He can also view the performance of the heart and its valves. ... The patient must not strain the heart in any strenuous activities. ...

  • Word Count: 925
  • Approx Pages: 4
  • Grade Level: High School

7. All About Heart Attacks

Heart Attacks Heart attacks are the leading cause of death in the United States. Heart attacks are caused by blockage in the arteries that carry blood to parts of the heart. ... If a small part of the heart dies, the heart can remain alive without it. But if a big part of the heart dies, it can cause death. ... Heart attacks can also be due to a blood clot. ...

  • Word Count: 360
  • Approx Pages: 1
  • Grade Level: High School

8. The effect of posture on heart

The average heart rate was 55.5 beats per minute. ... The body needs to maintain a constant cardiac output, which is the stoke volume, the volume of blood out each time the heart beats, multiplied by the heart rate, the number of times the heart beats per minute. ... Therefore stroke volume and heart rate should be low. ... This increases the physical activity will mean that the heart will beat faster to supply the respiring cell with oxygen thus increasing heart rate. ... This may be because the subject is quite a fit person, so therefore has a low heart rate, as his/her heart is particularly...

  • Word Count: 2184
  • Approx Pages: 9
  • Grade Level: High School

9. Abiocor Artificial Heart

There have been many different models for artificial hearts but none as promising as the newest product by Abiomed. ... However the history of artificial heart research spans farther back than this. ... Beyond that, some doctors used artificial hearts as temporary solutions for pending heart transplant patients (Nunn). ... Abiomed has designed this device to service the needs of patients suffering from coronary heart disease or congestive heart failure. The Abiocor Artificial Heart shows the possibilities when different sciences come together. ...

  • Word Count: 572
  • Approx Pages: 2
  • Has Bibliography
  • Grade Level: Undergraduate

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