By the start of the twentieth century, Germany and the United States had challenged some of Britain's economic lead. Subsequent military and economic tensions between Britain and Germany were major causes of the First World War, during which Britain relied heavily upon its empire.he British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom.
A heart murmur is an extra or unusual sound heard during a heartbeat. Murmurs range from very faint to very loud. Sometimes they sound like a whooshing or swishing noise. Normal heartbeats make a lub-DUPP or lub-DUB sound.This is the sound of the heart valves closing as blood moves through the heart.Doctors can hear these sounds and heart murmurs using a stethoscope.ometimes they sound like a whooshing or swishing noise. Normal heartbeats make a lub-DUPP or lub-DUB sound. This is the sound of the heart valves closing as blood moves through the heart. Doctors can hear these sounds and heart murmurs using a stethoscope.
Heartbeat Explained | Lub dub | Cardiac cycle | Human Anatomy and Physiology video 3D | elearnin. The valves of the chambers of the heart are made up of the muscles. This video depicts the rhythmic contractions and relaxations of the heart which constitute the heart beat. The heart continues to beat every moment in a person's life. Place your heart on the left side of your chest and you can feel your heartbeat. Doctors use stethoscope to feel your heartbeat. It is a device used to amplify the sound of your heart. It consists of a chest piece that carries a sensitive diaphragm, two ear pieces and a tube joining them.