By Dr Ananya Mandal, MD. Hormones are chemical messengers secreted from the ductless endocrine glands directly into the blood stream. Hormones have distinct structures that can sometimes be synthetically replicated to provide hormone replacement therapy in people who have certain types of hormone deficiency.y Dr Ananya Mandal, MD. Hormones are chemical messengers secreted from the ductless endocrine glands directly into the blood stream. Hormones have distinct structures that can sometimes be synthetically replicated to provide hormone replacement therapy in people who have certain types of hormone deficiency.
An ultrasound is a procedure that uses high frequency sound waves to scan the pelvic cavity and abdomen of a woman, and then creates a sonogram (a picture) of the placenta and the baby. The terms sonogram and ultrasound are technically very different. However, the two are used interchangeably.n ultrasound is a procedure that uses high frequency sound waves to scan the pelvic cavity and abdomen of a woman, and then creates a sonogram (a picture) of the placenta and the baby. The terms sonogram and ultrasound are technically very different. However, the two are used interchangeably.
From Wikipedia, the free encyclopedia. Endoscopic ultrasound (EUS) or echo-endoscopy is a medical procedure in which endoscopy (insertion of a probe into a hollow organ) is combined with ultrasound to obtain images of the internal organs in the chest, abdomen and colon.It can be used to visualize the walls of these organs, or to look at adjacent structures.Combined with Doppler imaging, nearby blood vessels can also be evaluated. Endoscopic ultrasonography is most commonly used in the upper digestive tract and in the respiratory system.t can be used to visualize the walls of these organs, or to look at adjacent structures. Combined with Doppler imaging, nearby blood vessels can also be evaluated. Endoscopic ultrasonography is most commonly used in the upper digestive tract and in the respiratory system.