The enzyme, which exists chiefly in skeletal muscle, heart and brain, is grossly elevated in active muscular dystrophy and rises early in myocardial infarction is

Secretion of hormones by the anterior pituitary may be controlled by the circulating levels of hormones from the respective target gland, as well as hormones secreted by what organ?

In order to diagnose a patient with cystic fibrosis, this test must be performed and will 2-5 times the normal concentration.

Which one of the following is used in the biosynthesis of T3 and T4?

Conjugated bilirubin is broken down by bacteria in the intestine into which compound?

A patient visits her primary care because of the development of symptoms including excessive upper body weight gain, a collection of fat between her shoulder blades and her face appearing swollen and red. The doctor orders a cortisol level that comes back elevated. What is the possible diagnosis?

Excess cortisol is actively binding to its receptors on the hypothalamus. The negative feedback mechanism of the endocrine system would cause which of the following?

Pituitary secretion of ACTH is inhibited by elevated levels of

Pituitary secretion of ACTH is inhibited by elevated levels of

An 8-year old girl is seen by her pediatrician with the following symptoms: failure to gain weight, lethargy, weakness, and some impairment of school performance. Following thyroid hormone analysis, the following results were obtained: decreased T4/T3 and elevated TSH. Which of the following would be the most likely cause of her disease?