The endocrine system:

  1. releases chemicals into the bloodstream for distribution throughout the body

  2. releases hormones that alter the metabolic activities of many different tissues and organs

  3. produces effects that can last for hours days or even longer

  4. can alter gene activity of cells

  5. all of the above

Answer:

e

Each of the following hormones is an amino acid derivative EXCEPT:

  1. epinephrine

  2. melatonin

  3. thyroxine (T)

  4. thyroid stimulating hormone (TSH)

  5. norepinephrine

Answer:

d

When adenyl cyclase is activated:

  1. cAMP is formed

  2. cAMP is broken

  3. G-proteins bind to cAMP

  4. steroid hormones enter the cell

Answer:

a

Which of the following hormones does NOTact by a second messenger system:

  1. glucagon

  2. epinephrine

  3. growth hormone

  4. testosterone

  5. ACTH

Answer:

d

This hypophyseal structure receives signals from the hypothalamus via the hypophyseal portal vein:

  1. follicles

  2. adenohypophysis

  3. neurohypophysis

  4. pars intermedia

  5. supraoptic nucleus

Answer:

b

Low blood glucose level typically results in the secretion of all of the following EXCEPT:

  1. glucagon

  2. thyroxine (T)

  3. hGH

  4. PTH

  5. none of the above

Answer:

d

The action of glucocorticoids involves many functions but only one of the following is a correct one:

  1. increases inflammatory responses

  2. decreases lipid hydrolysis (lipolysis)

  3. increases glucose levels

  4. retention of electrolytes by the kidneys

  5. increases osteoclast activity

Answer:

c

This hormone acts on the intestines and causes increased calcium absorption:

  1. calcitonin

  2. calcitriol

  3. thyroxine

  4. pancreatic polypeptide

  5. corticotropin releasing factor (CRF)

Answer:

b

Thyroid stimulating hormone (TSH) causes all of the following EXCEPT:

  1. activation of thyroid follicular cells

  2. increased iodide trapping in thyroid follicles

  3. increased thyroglobulin synthesis

  4. increased release of T3/ T4

  5. all of above are correct

Answer:

e

The pancreatic cells that secrete insulin are the:

  1. F-cells

  2. principal cells

  3. alpha cells

  4. beta cells

  5. delta cells

Answer:

d