How a hydrogen fuel cell generates electricity. The following step-by-step explanation describes how a fuel cell generates the electricity used to power the vehicle: 1. Hydrogen is supplied to the anode (negative) side of the fuel cell. 2. Hydrogen molecules activated by the anode catalyst release electrons. 3. The electrons travel from the anode to the cathode (positive) side of the fuel cell, creating an electrical current. 4.
A. A heart murmur is a sound that is created by inadequate blood flow through the heart and its large vessels, for example the aorta. Some are born with a heart murmur and further testing doesn't reveal any significant problem.This is called a physiological murmur.eart murmur Cardiology An auscultatory sound of cardiac or vascular origin, usually caused by an abnormal flow of blood in the heart due to structural defects of the valves or septum; murmurs may be benign or pathological.
The dub ( diastolic sound) occurs when part of the heart relaxes and the aortic and pulmonary valves close. A heart murmur is an extra sound, such as a whooshing, caused by irregular blood flow through the heart valves. Heart murmurs can be heard through a stethoscope and are often detected during routine physical examinations. If your heart murmur is related to more serious problems, your doctor may refer you to a cardiologist (heart specialist).