A nurse is educating a pregnant client about the endocrine changes during pregnancy.

Which hormone is responsible for inhibiting ovulation and stimulating milk production?

95 to 105 mmHg.

This is the normal range for PaO2 in pregnancy according to several sources.

PaO2 is the partial pressure of oxygen in arterial blood and reflects the oxygenation of the blood.

It is influenced by factors such as ventilation, perfusion, diffusion, and hemoglobin affinity.

Choice A is wrong because 27 to 32 mmHg is too low for PaO2 and would indicate severe hypoxemia or low oxygen levels in the blood.

Choice C is wrong because 500 to 700 mL is a measure of tidal volume, not PaO.

Tidal volume is the amount of air that moves in and out of the lungs with each breath.

Choice D is wrong because 7 to 10 L/min is a measure of oxygen flow rate, not PaO.

Oxygen flow rate is the amount of oxygen delivered to a patient through a device such as a nasal cannula or a mask.

Prolactin is a hormone that is responsible for inhibiting ovulation and stimulating milk production during pregnancy.

It is produced by the anterior pituitary gland and increases throughout pregnancy.

Choice A is wrong because hCG (human chorionic gonadotropin) is a hormone that is produced by the placenta and maintains the corpus luteum, which secretes progesterone and estrogen.

hCG does not inhibit ovulation or stimulate milk production.

Choice B is wrong because progesterone is a hormone that is produced by the corpus luteum and the placenta and supports the endometrium, prevents uterine contractions, and prepares the breasts for lactation.

Progesterone does not inhibit ovulation or stimulate milk production.

Choice C is wrong because estrogen is a hormone that is produced by the corpus luteum and the placenta and stimulates uterine growth, blood flow, and breast duct development.

Estrogen does not inhibit ovulation or stimulate milk production.