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.
The diagnostic medical sonographer presses an instrument called an ultrasound transducer to the parts of the patientâs body that are being examined. The transducer emits pulses of sound that bounce back, causing echoes. The echoes are then sent to the ultrasound machine, which processes them and displays them as images.