The human heart is a specialized, four-chambered muscle that maintains BLOOD flow in the CIRCULATORY.
Located in the thorax, it lies left of the body's midline, above and in contact with the.
diaphragm. It is situated immediately behind the breastbone, or sternum, and between the lungs, with its.
apex tilted to the body cavity's left side. In most people the apex can be felt during each heart.
contraction. At rest, the heart pumps about 59 cc (2 oz) of blood per beat and 5 l (5 qt) per minute,.
compared to 120-220 cc (4-7.3 oz) per beat and 20-30 l (21-32 qt) per minute during exercise. The adult.
human heart is about the size of a fist and weighs about 250-350 gm (9 oz).
Blood supplies food and oxygen to the cells of the body for their life needs and removes the waste.
products of their chemical processes. It also helps to maintain a consistent body temperature, circulate.
hormones, and fight infections. The brain cells are very dependent on a constant supply of oxygen. If the.
circulation to the brain is stopped, death ensues shortly. Since heart attacks are the number-one cause.
of death in the United States, the heart gets a great deal of attention.
The role of the heart was long considered a mystery and often given elevated importance. Some thought it.
was the seat of the soul. Others thought it was the center of love, courage, joy, and sadness. Primitive.
man must have been aware of the heartbeat and probably recognized the heart as an organ whose malfunction.
could cause sudden death.
The Hippocratic De Corde, which probably dates from the time of ARISTOTLE, describes the construction of.
the heart's valves. LEONARDO DA VINCI made exquisite drawings of the heart, but it was not until the.
publication of William HARVEY's De Motu Cordis (1628) that the heart's specific role in relation to.
circulation was widely understood.
STRUCTURE AND FUNCTION OF THE HUMAN HEART.
The heart's wall has three parts. Muscle tissue, or myocardium, is the middle layer.
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. ...
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 ...
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. ...
