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.
Heart palpitations. Palpitations are feelings or sensations that your heart is pounding or racing. They can be felt in your chest, throat, or neck. The heart's rhythm may be normal or abnormal when you have palpitations. Normally the heart beats 60 to 100 times per minute. The rate may drop below 60 beats per minute in people who exercise routinely or take medicines that slow the heart.