The heart is one of the most vital organs in the body. It has many different functions and parts. One of the important parts of the heart is the pericardium. The pericardium is the fluid filled sac that surrounds the heart and the proximal ends of the aorta, vena cava, and the pulmonary artery. There are about three functions of the pericardium. 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. The pericardium is divided into about three layers. The first layer is the Fibrous Pericardium. "The Fibrous Pericardium is the outer fibrous sac that covers the heart."# 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. The second layer of the pericardium is the viseral pericardium also known as the epicardium. "The viseral pericardium or the epicardium is the outer layer of the wall of the heart."# It is composed of connective tissue covered by epithelium. It provides an extra outer layer for the heart. "The third layer of the Pericardium is known as the parietal pericardium. The parietal pericardium lies between the viseral pericardium and the fibrous pericardium."# It is used to provide an additional layer of insulation of the heart. .
Another important part are the coronary arteries. "The heart muscle is supplied by the coronary arteries which are direct branches of the ascending aorta, so the heart muscle gets the freshest blood possible. The heart muscle is drained by the cardiac veins. Most of the drainage goes from the coronary sinus into the right atrium. A small amount of blood drains directly into the right atrium by the way of the cardiac veins."# The heart is supplied by two major coronary arteries, the right and the left. The left coronary divides into two branches; the anterior interventricular and the circumflex branch.
The Heart Description: Your heart is about the size of your fist. ... The heart is a muscle; it acts like a small pump. ... The middle of the heart is called myocardium. ... • Coronary Heart Disease: It is the most common heart disease in the US today. ... Sometimes the heart will skip a beat, or it might be a continuous slow or fast heart rate. ...
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. ...
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. ...
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...
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...
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. ...
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. ...
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...
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. ...
