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.
Heart murmurs and other sounds. A heart murmur is a blowing, whooshing, or rasping sound heard during a heartbeat. The sound is caused by turbulent (rough) blood flow through the heart valves or near the heart. The heart has four chambers: Two upper chambers (atria)