ap2 ch28 final
What role does oxytocin play in promoting labor?
Oxytocin stimulates the uterus to contract.
What reaction prevents more than one sperm from binding to an oocyte during fertilization?
cortical reaction
Which of the following is the longest stage of labor, lasting 6-12 hours or more?
dilation stage
Which fetal vascular shunt directly connects the right atrium to the left atrium so as to bypass the nonfunctional lungs?
foramen ovale
What is the name for the period of time that extends from the last menstrual period until birth, which is approximately 280 days?
gestation period
Which hormone is required to maintain the corpus luteum and prevent menstruation?
hCG
Together, what do the decidua basalis and the chorionic villi form?
placenta
Which of the following serve(s) as the direct trigger to begin the more vigorous, rhythmic contractions of true labor?
prostaglandins
The foramen ovale and the ductus arteriosus are both examples of __________.
pulmonary bypass shunts, which serve to bypass the lungs
A lack of _____ can, without treatment, lead to _____ in premature infants.
surfactant; alveolar collapse
Which of the following takes oxygenated blood to the liver from the placenta?
umbilical vein
Which of these is the innermost (closest) structure that completely surrounds the embryo?
amnion
Which of the following implants in the mucosa of the endometrium?
blastocyte
Which term, by definition, includes all the other terms?
conceptus
Which of the following is NOT a change in female anatomy or physiology during pregnancy?
A tightening of pelvic ligaments to help bear the extra weight of the growing fetus
A couple undergoes a workup for infertility, which shows that the man has a low sperm count. The couple asks why this is a problem because "it only takes one sperm to fertilize an egg." How could you explain their problem?
Although a single sperm fertilizes the egg, many others prepare the egg for its entry.
Which of the following statements about the acrosomal reaction is correct?
The acrosomal enzymes released from many sperm digest holes through the zona pellucida.
The prefix sclero- means hard or dry. The prefix embry- means embryo. The prefix -derm- means skin, covering, or integument. The prefix lact(i)- means milk or lactose.
The process of milk production is called lactation. The ectoderm is the layer of cells on the dorsal embryonic surface that will become nervous system and the epidermis of skin. The embryoblast of the blastocyst is another name for inner cell mass, which will become the embryo. The sclerotome is the component of each somite that becomes the vertebrae and ribs.
Which statement best describes the result of binding and fusion of the sperm's membrane to the oocyte plasma membrane?
They allow the contents of the sperm to enter the oocyte cytoplasm.