Mark the following statements as true or false. If a statement is false, correct it to make a true statement.




a. About 90% of the thyroid hormone produced is triiodothyronine (T3).

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. The secretion of most hormones is regulated by a negative feedback system.

Which of the following is not a potential effect that a hormone could have on its target cell?

a. Activating genes in the DNA

b. Stimulating cellular division

c. Altering the permeability of the plasma membrane

d. All of the above are potential effects of a hormone on its target cell.

How does ADH affect the amount of water in the body, and how does it accomplish this? How does this affect the osmolarity of the blood?

List the target tissues and effects of the following anterior pituitary gland hormones.

a. Thyroid-stimulating hormone

b. Adrenocorticotropic hormone

c. Prolactin

d. Gonadotropins

e. Growth hormone

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

b. Thyroxine (T4) is the more active of the two thyroid hormone

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Iodine atoms are a key component of parathyroid hormone.

Fill in the blanks: A rise in free T3 and T4 would be expected to produce a(n)______ in TRH and TSH secretion. A decrease in free T3 and T4 would be expected to produce a(n)_____in TRH and TSH secretion.

Which of the following statements correctly describes the role of parathyroid hormone?

a. Parathyroid hormone regulates the metabolic rate.

b. Parathyroid hormone increases the blood calcium ion concentration.

c. Parathyroid hormone decreases the blood sodium ion concentration.

d. Parathyroid hormone causes water retention by the kidneys.