Specialized cardiac muscle tissue which conducts impulses.
Term Papers Tagged With: Heart 4 pages, words The heart is evolutionary masterpiece. Yet like everything else in nature, it is not perfect and problems may arise.
However before its flaws can be mentioned and analysed. It would be prudent to understand how the heart functions in the first place before going in depth into the various problems that might arise within the cardiac cycle. Of which a large number are covered under the various Arrhythmias, which can be divided into two major groups, ventricular arrythythmias and supraventricular arrythythmias.
Subdivision is possible, with arrhythmias further divided into Disorders of impulse conduction and disorders of impulse generation.
The top chambers of the heart are called the atria and the bottom chambers, the ventricles. A normal heart beat begins when the Sino-Atrial Node, located on the posterior wall of the right atrium.
This ensures that the ventricles are filled before the ventricles contract. As the pressure in the ventricles increases, the AV valves close. This prevents the backward flow of blood.
With continued contraction of the ventricles, blood leaves the heart via the aortic and pulmonary valves into the aorta and pulmonary artery respectively. At the end of the cardiac cycle, all the chambers relax, the aortic and pulmonary valves close, preventing the blood from flowing back into the heart.
Atria begin to fill up with blood once more to prepare for the start of the next cycle. Systolic blood pressure is the pressure when the heart ventricles contract and pump blood out of the heart. This is the highest A person with a healthy The cardiac cycle as seen above is definitely not a simple process.
In its complexity a number of problems may arise, of which Arrhythmias constitute a relatively large proportion. Arrhythmias are defined as any deviation from the normal, steady beating rhythm of the heart. Small, minor irregularities in the heartbeat are common, but more serious arrhythmias can lead to fainting, angina or even heart attack.
They can be diagnosed primarily with the electrocardiograph, this records the electrical impulses made by the beating of the heart.
An arrhythmic heart will produce an uneven pattern as compared to regular peaks and valleys of a normal heartbeat. Occasionally, an arrhythmia is so mild that not much treatment is required.
However more often than not, most arrhythmia are treated with medication, defibrilators, or pacemakers. These serve to steady the irregularities and maintain a healthy steady heartbeat.
A very common form of Arrhythmias is Sinus Bradycardia. This essentially means that the Sino-Atrial node, which normally controls the heart rate, is generating electrical signals that are generally slower than they normally would be. Sinus Bradycardia is not necessarily abnormal.
Young, healthy people, especially athletes will usually have heart rates less than 60 because their hearts become very efficient at pumping.
When Sinus Bradycardia does cause problems, it is often in the elderly, This arrhythmia can be the result of medications taken for high blood pressure, angina or tachycardia.
If there are no symptoms due to a Sinus Bradycardia then nothing needs to be done. However it can cause serious problems if not investigated. Sick Sinus Syndrome is the name given to the medical condition in which a diseased sinus node results in the severe slowing of the heart beat. Such a condition would include the afore mentioned Sinus Bradycardia.
Sometimes the Sino-Atrial node ceases firing temporarily and long pauses in the cardiac cycle would result. This condition causes symptoms of fatigue, light-headedness, shortness of breath and even fainting.
It can occur at any age over 30, although it is usually in patients above the age of 50 years. Intrinsic and extrinsic problems may contribute to causing the Sick Sinus Syndrome.
Intrinsic problems include the natural process of aging, ischmia, scarring or physical damage.Radiologists and cardiac imagers including cardiologists should understand and become familiar with the complex morphology and physiology of congenital heart diseases, as well as with various palliative and corrective surgeries performed for these patients to obtain diagnostic quality cardiac CTA and to promptly recognise the imaging features of normal and abnormal post-operative appearance seen in this .
Heart rate is described as the rate of the cardiac cycle. Heart rate is measured in beats per minute (bpm). These graphs are useful in the diagnosis of heart disease and heart abnormalities.
The Veins are what bring back the carbon dioxide blood to the heart. It then has to be put through a cycle so that it can be shipped back out. Heart is responsible for the blood flow to every single part of the body by constant contraction and relaxation of cardiac muscles. More about The Heart Essay examples. Heart Abnormalities. Lab Report the Effects of Drugs on Cardiac Physiology Essay. A. Pages:9 Words This is just a sample. To get a unique essay. These graphs are useful in the diagnosis of heart disease and heart abnormalities. Alongside natural heart abnormalities are those induced by chemical substances. We will write a custom essay sample on Lab. Abnormalities In The Cardiac Cycle. Filed Under: Term Papers Tagged With: Heart. 4 pages, words The various and detailed events that take place with every heart beat is referred to as the “cardiac cycle”. The top chambers of the heart are called the atria and the bottom chambers, the ventricles. The Essay on Affects of Physical.
Alongside natural heart abnormalities are those induced by chemical substances. [tags: Papers] - In the essay, “Reading and Thought” by. Abnormalities in the fetus growth have become common nowadays. These abnormalities may be due to physical, radiation and chemical factors.
The most common factor is due to genetic mutation, which causes mental retardation, abnormal body buildup and other conditions, which bring a lot of troubles in the future to the child themselves and their. Cardiac conduction is the driving force behind the cardiac cycle. This cycle is the sequence of events that occur when the heart beats.
During the diastole phase of the cardiac cycle, the atria and ventricles are relaxed and blood flows into the atria and ventricles.
In the systole phase, the ventricles contract sending blood to the rest of the body. Essay on Abnormalities in the cardiac cycle. that might arise within the cardiac cycle. Of which a large number are covered under the various Arrhythmias, which can be divided into two major groups, ventricular arrythythmias and supraventricular arrythythmias.
Essay: Heart failure Heart failure occurs when the heart is unable to pump enough blood around the body and, thus, is unable to supply enough blood flow through the body, away from the heart. This results in insufficient oxygen delivery for organs and tissues.