Practice quiz 28

How long is the secondary oocyte viable and capable of being fertilized after it is ovulated?

12-24 hours

The placenta, a vitally important metabolic organ is made up of a contribution from mother and fetus. Which portion is from the fetus?

Chorion

The time from the last menstrual period until birth of the baby is called

Gestation

Select the correct statement about fertilization

Millions of sperm cells are destroyed by the vagina's acidic environment.

The first major event of organogenesis is __________.

Neurulation

human chorionic gonadotropin (hCG) is at its highest levels

about 2 months after implantation during the 8th gestational week

Which ion is responsible for completion of meiosis II of the secondary oocyte after sperm enters the oocyte

calcium

Prior to the let-down reflex, the mammary glands secrete a yellowish fluid called ________ that has less lactose than milk and almost no fat.

colostrum

Neural tissue is formed by the ________.

ectoderm

The corpus luteum prevents loss of the implanted embryo through menstruation by secreting

estrogen and progesterone

At what point is meiosis II completed for the female gamete?

fertilization

The neonatal period refers to

first month after birth

Which of the following refers to the transfer of sperm and harvested oocytes together into the woman's uterine tubes in the hopes that fertilization will take place there?

gamete intrafallopian transfer (GIFT)

Which hormone maintains the viability of the corpus luteum?

human chronic gonadotropin

a beery shape structure of 16 or more cells is called

morula

Milk ejection (the letdown reflex) is stimulated by which of the following hormones associated with pregnancy?

oxytocin

gastrulation begins when a groove with raised edges called the ____ appears on the dorsal surface of the embryonic disc

primitive streak

Relaxin is a hormone produced by the placenta and ovaries. The function of this hormone is to ________.

relax the public symphysis

The sperm travels through the cervix and vagina, and reaches the uterine tube to meet the egg by _____

reverse peristalsis

Which of the choices below occurs if implantation is successful?

the corpus luteum is maintained until the placenta takes over its hormone-producing functions

it is impossible for sperm to be functional cable to fertilize the egg until after

they undergo capacitation

Which method of contraception is MOST reliable

vasectomy

The ____ is responsible to form the digestive tube and first blood cells of the fetus?

yolk sac

The correct sequence of pre embryonic structure is _____

zygote, morula, blastocyte