Which hormone is correctly paired with its action?
a. Oxytocin — stimulates uterine contractions during childbirth
b. Thyroxine — inhibits metabolic processes
c. ACTH — inhibits the release of glucocorticoids by the adrenal cortex
d. Melatonin — raises blood calcium level

Which statement is accurate?

a. Hormones that differ in effect reach their target cells by different routes through the body.

b. Pairs of hormones that have the same effect are said to have antagonistic functions.

c. Hormones are often regulated through feedback loops.

d. Hormones of the same chemical class usually have the same function.

Which of the following is not an accurate statement?

a. Hormones are chemical messengers that travel to target cells through the circulatory system.

b. Hormones often regulate homeostasis through antagonistic functions.

c. Hormones of the same chemical class usually have the same function.

d. Hormones are often regulated through feedback loops.

How do steroid hormones differ from polypeptide hormones and most amino-acid-derived hormones?

a. Steroid hormones are lipid soluble and cross plasma membranes readily.

b. Polypeptide and amino-acid-derived hormones are longer-lived in the bloodstream and thus exert greater signal amplification.

c. Polypeptide hormones are the most structurally complex and induce permanent changes in target cells.

d. Only steroid hormones bind to receptors in the plasma membrane.

The hypothalamus

a. Synthesizes all of the hormones produced by the pituitary gland.

b. Influences the function of only one lobe of the pituitary gland.

c. Produces only inhibitory hormones.

d. Regulates both reproduction and body temperature.