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.
Early Puberty in Boys. Tweet. Puberty is the time when boysâ bodies and minds mature and they grow into young men. This usually starts when a boy is about 12 years old. Sometimes, though, a much younger boy starts to show the signs of puberty. This is called precocious (pre-KOH-shuss), or early puberty (PU-ber-ty).arly Puberty in Boys. Tweet. Puberty is the time when boysâ bodies and minds mature and they grow into young men. This usually starts when a boy is about 12 years old. Sometimes, though, a much younger boy starts to show the signs of puberty. This is called precocious (pre-KOH-shuss), or early puberty (PU-ber-ty).