Also, Doppler can detect abnormal blood flow within the heart, which can indicate a problem with one or more of the heart's four valves. Color Doppler. Color Doppler is an enhanced form of Doppler echocardiography. With color Doppler, different colors are used to designate the direction of blood flow.
Quick Answer. The age at which people grow armpit hair varies, but for boys it is often between the ages of nine and 14. Girls typically begin to grow this hair between eight and 13 years of age. Keep Learning.
Boys. 1  You will start puberty between the ages of 10 and 16. 2  You will see hair begin to appear under your arms, around your groin, and on your face, and hair on your arms, legs, and other areas of your body will become thicker and heavier. 3  Your penis and your testes will grow larger. Usually, that means that your voice will become deeper. 2  You will see hair begin to appear under your arms, around your groin, and on your face, and hair on your arms, legs, and other areas of your body will become thicker and heavier. 3  Your penis and your testes will grow larger.