In what way is the level of oxytocin controlled by a positive-feedback mechanism?
a.) the oxytocin in blood stimulates the pituitary to maintain the same level of oxytocin.
b.) the oxytocin in blood stimulates the pituitary to secrete more oxytocin.
c.) the oxytocin in blood stimulates the pituitary to secrete less oxytocin.

The correct answer is option B.  The oxytocin in the blood stimulates the pituitary to secrete more oxytocin.

Explanation:

Oxytocin is a hormone produced in the hypothalamus and released by the posterior pituitary. It plays a vital role in childbirth, sexual reproduction, and the period after childbirth. It can cause labor contraction during childbirth.

Oxytocin production is regulated by a positive feedback mechanism. This is a positive feedback mechanism that allows the release of the oxytocin hormone when stimulation occurs. Then The hormone causes an action in the body, such as the start of labor contractions or the letdown of milk, which signals more production of oxytocin.

Thus, the correct answer would be option B.