Mastering AandP Chapter 27

Which of the following consists of ectodermal contributions?

all neural tissue, including the brain and spinal cord

The presence of which placental hormone (in blood or urine samples) provides a reliable indication of pregnancy?

human chorionic gonadotropin (hCG)

At which day post cleavage does implantation occur?

Day 7

Regarding maternal nourishment after delivery, which is correct?

Oxytocin causes the contraction of myoepithelial cells in the walls of the lactiferous ducts and sinuses.

Which is true regarding the physiological stresses of pregnancy?

The volume of blood flowing into the placenta reduces the volume in the systemic circuit of the mother.

Gastrulation produces an oval, three-layered sheet known as which of the following?

embryonic disc

Three days postcleavage, the pre-embryo is a solid ball of cells known as which of the following?

morula

Cervical dilation is caused by which of the following placental hormones?

relaxin

Which gestational period is dominated by the development of organs and organ systems?

second trimester

During the dilation stage of labor:

the amnion ruptures late in the stage.

Regarding the factors of true labor:

the fetal pituitary releases oxytocin in response to estrogens.