In the gastrointestinal (GI) tract, dopamine functions as a modulator of the enteric nervous system or as a paracrine substance. What essential enzyme is required for synthesis of dopamine in the dopaminergic system in the GI tract?

Inhibition of growth hormone (GH) occurs through the action of

The gap between two communicating neurons is called the:

Patient TSH T4 (free Thyroxine) Antimicrosomal antibody A Decreased Decreased Positive B Increased Increased Positive C Normal Decreased Negative D Increased Decreased Positive   Which one of the above patient’s results are consistent with Hashimoto’s thyroiditis (primary hypothyroidism)?

An oncofetal antigen commonly used to assess recurrence of tumor growth following removal of a colon tumor would be

A 35-year-old man visits his physician with complaints of sudden onset of fatigue, polydipsia, and polyuria. Laboratory results indicate a normal fasting blood sugar. Serum sodium was slightly elevated. The most likely cause of these symptoms and laboratory results would be

 The hormone that triggers ovulation is:

The release of thyrotropin-releasing hormone (TRH) from the hypothalamus stimulates thyrotropin release (TSH) from the pituitary, which further leads to synthesis and secretion of thyroid hormone (T4 & T3) from the thyroid gland. When the concentration of thyroid hormone in the blood turns off the release of thyrotropin from the pituitary, this is referred to as what type of feedback?

The hypothalamic hormone that inhibits prolactin is referred to as prolactin-inhibiting hormone but is actually

This tumor marker can be used to monitor ovarian cancer.