An ultrasound scan uses high-frequency sound waves to create images of the inside of the body. They can help evaluate fetal development, as well as detect issues in various organs. Ultrasound scans, ...

S1 and S2 are the normal heart sounds you hear when the heart valves close. Heart murmurs are extra sounds that can be heard during systole, diastole, or as a continuous sound. S3 and S4 are abnormal ...