Endocrine System Quiz

Secretin is released from the duodenum in response to:

A. hydrochloric acid in chyme

When chyme enters the duodenum, gastric secretion increases. T/F

false

The enzyme phosphorylase catalyzes the conversion of A) glycogen into glucose-6-phosphate. B) glycogen into glucose. C) glucose into glycogen. D) glucose into glucose-6-phosphate. E) glucose-6-phosphate into glycogen.

A) glycogen into glucose-6-phosphate.

Epinephrine causes the liver to uptake glucose from the bloodstream during the fight-or-flight response. A) True B) False

B) False

Which of the following statements about thyroxine is TRUE?

Both the T3 and T4 forms enter target cells.

Epinephrine binds to A) α-adrenergic receptors on the cell membrane of liver cells. B) α-adrenergic receptors in the cytoplasm of liver cells. C) β-adrenergic receptors on the cell membrane of liver cells. D) β-adrenergic receptors in the cytoplasm of liver cells. E) β-adrenergic receptors in the nucleus of liver cells.

C) β-adrenergic receptors on the cell membrane of liver cells.

Which of the following enzymes is produced by the stomach?

pepsin

Which of the following statements about thyroxine is TRUE? it is water-insoluble -it is lipophilic -it cannot pass through the cell membrane -the first and second choices are correct -all three choices are correct

the first and second choices are correct

Gastrin functions to increase the production of HCl in the stomach. T/F

true

Glucocorticoid response elements function as enhancers. T/F

true

The glucocorticoid receptor is active as a dimer. T/F

true

The thyroxine-hormone receptor complex increases the level of transcription of specific genes.

true

TorF: thyroxine is brought to target cells via a protein-carrier

true

Steroid hormones are water-soluble.

False

The binding of epinephrine to its receptor activates ________ which in turn activates ________. A) protein kinase A ; G protein B) protein kinase A ; adenylyl cyclase C) adenylyl cyclase ; G-protein D) G-protein ; adenylyl cyclase E) G-protein ; protein kinase A

D) G-protein ; adenylyl cyclase

Steroid hormones travel in the blood attached to protein carriers. T/F

True

The conversion of ATP into cAMP is catalyzed by the enzyme adenylyl cyclase. A) True B) False

True

The steroid hormone-receptor complex binds to:

hormone response elements in DNA.

Steroid hormones bind to

protein receptors in the cytoplasm or nucleus of the target cell.

Which of the following does NOT stimulate the secretion of HCl in the stomach?

secretin

Glucocorticoids are ________ hormones secreted by ________ glands.

steroid; endocrine

The mode of action of steroid hormones involves

stimulation of mRNA transcription.

Glucocorticoid hormones activate genes that are involved in which of the following processes?

synthesis of glucose mobilization of fats breakdown of proteins

the thyroid gland secretes large amounts of _____ and _____ -triiodothyronine; no tetraiodothyronine -tetraiodothyronine; small amounts of triiodothyronine -tetraiodothyronine; no triiodothyronine

tetraiodothyronine; small amounts of triiodothyronine