Exam 13: Endocrine System

Down-regulation of a target cell can occur in response to

A hormone has a half-life of 20 minutes. After an hour, ________ percent of the original number of molecules remains.

A fetus develops a malformation in the pituitary gland which causes it to lack melanocyte-stimulating hormone. This results in lack of skin and eye coloration, similar to albinism. The malformed portion of the pituitary gland is a structure called the ________.

Hyposecretion of hormones from the adrenal cortex leads to

Infantile hypothyroidism results from

The hormone that the pineal gland secretes is

Upregulation of a target cell can occur in response to

Type 2 diabetes mellitus results from

The blood concentration of growth hormone

With age,

Your friend puts on a mask and chases you as a prank. Your body responds by releasing epinephrine and norepinephrine, along with other physiological responses. Your friend frightening you is the ________, that cause the body's response.

One of the hallmarks of Graves disease is

The opposing roles of the thyroid and parathyroid maintain the balance of calcium and phosphate ions in the blood. What will happen if the parathyroid gland develops a defect that prevents PTH secretion?

The ________ secretes triiodothyronine.

A tropic hormone prevents endocrine glands from releasing their hormones, thereby maintaining homeostasis.

Simple goiter is most prevalent where the soil lacks

Paracrine substances called ________ have powerful, regulating effects on cellular responses to hormones.

The nervous system releases neurotransmitters into synapses. In contrast, the endocrine system releases ________ into the bloodstream.

Irving, who is 78 years old, takes human growth hormone supplements to regain the strength of his youth. He may be disappointed because the hormone has been shown only to

Diabetes insipidus is caused by