Explain the difference in the technology behind several different ...

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Explain the difference in the technology behind several different diagnostic imaging procedures.
 
  What will be an ideal response?

Question 2

Explain why the pituitary gland is sometimes referred to as the master gland.
 
  What will be an ideal response?

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Answer to Question 1

1. Computed tomography scan
 Uses X-rays
 Produces cross-sectional view
 Takes multiple-angle views
2. Ultrasound
 Uses high-frequency sound waves
 Echoes off internal structures and computer uses to produce an image
3. Magnetic resonance imaging
 Uses electromagnetic energy
 Shows soft tissues
4. Nuclear medicine
 Uses radioactive substances
 Accumulates in certain body tissues
 Radioactivity emitted exposes an X-ray film to produce an image
5. Positron emission tomography
 Patient given injection of radioactive glucose
 Glucose accumulates in areas of high metabolic activity
 Radioactive glucose exposes a plate to produce an image
6. Contrast studies
 Radiopaque dye is injected or swallowed
 Body structures containing dye are outlined on X-ray

Answer to Question 2

The pituitary gland secretes hormones that are responsible for regulating the activity of other endocrine glands.
 Thyroid-stimulating hormone regulates the thyroid gland.
 Adrenocorticotropic hormone regulates the adrenal cortex.
 Follicle-stimulating hormone and luteinizing hormone (the gonadotropins) regulate the gonads (ovaries and testes).