What is the pacemaker of the heart? What happens to the blood when the heart contracts and relaxes? Explain the condition of heart arrhythmia. What is meant by the following terms: A. mitral valve prolapse B. calcific aortic stenosis C. ventricular fibrillation ...
The timing is the result of a system of fibers that runs from the top of the atrium to the apex, where the fibers break into two pathways leading to the left and right ventricles. These fibers found within the walls of the heart are known as Purkinje fibers. The function of Purkinje ...
Pacemaker cells generate an electrical impulse approximately 70 times per minute when the heart is at rest and up to 160 times each minute during vigorous exercise. All of the heart’s cells are capable of acting as a pacemaker cell. The cells located in the sinoatrial node, however, are ...
Starting the heart One of the first sci-fi novels, Frankenstein by Mary Shelley has had a huge impact on science. Earl Bakken, the inventor of the pacemaker (起搏器), a device placed into the chest that helps the heart to pump blood using small electrical impulses, was inspired by the ...
An implantable pacemaker, also known as an artificial pacemaker, is an internal medical device that regulates the beating of the heart to a sufficient rate that meets the body's needs. This type of pacemaker is used in patients whose heart rate is too fast, a condition called tachycardia; wh...
What structure is also known as the pacemaker of the heart? What is the uppermost layer of the epidermis? Where is the coronary artery? Which ventricle is surrounded by the choroid plexus? Where is the myocardium located in the heart? Where is the heart located? How many layers of tissue ...
Pacemaker cells generate an electrical impulse approximately 70 times per minute when the heart is at rest and up to 160 times each minute during vigorous exercise. All of the heart’s cells are capable of acting as a pacemaker cell. The cells located in the sinoatrial node, however, are ...
Coronary heart disease is also known as ischaemic heart disease. It is a type of heart disease that occurs when these arteries become narrow or blocked due to a build-up of fatty deposits of plaque. Plaque is made up of fat, cholesterol, calcium and other substances found in the blood. ...
This is known as congestive heart failure. Heart failure is a long-term condition that tends to get worse over time. It is important to manage your health to improve your quality of life.What are the signs and symptoms of heart failure?
sinus node powers electrical stimulation through the heart, causing it to contract, first the upper chambers and then the lower chambers. The heart’s contraction is what causes it to beat. Because the sinus node keeps the heart beating normally, it is often referred to as a naturalpacemaker....