The nurse teaches a class that which of the following is the ...

[roselinechinyere27m]

The nurse teaches a class that which of the following is the first gender change to occur in the embryo?
 
  A.
  Destruction of the Y chromosome in the female embryo
  B.
  Development of dominance in the primitive duct structure
  C.
  Formation of primitive external genitalia that are visible on ultrasound
  D.
  Spermatogenesis and oogenesis in male and female embryos, respectively

Question 2

The perinatal nurse mentor teaches the new nurse about the functions of cervical mucus. What information should the nurse include? (Select all that apply.)
 
  A.
  Provides an acidic environment for sperm
  B.
  Acts as a bacteriostatic agent
  C.
  Provides a barrier to sperm during nonfertile phases
  D.
  Provides an easy-flowing pathway during fertile phases
  E.
  Forms an operculum to protect the pregnancy

[tuate]

Answer to Question 1

ANS: B
Differing male/female developmental changes in the mesonephric and paramesonephric ducts include the development of dominance in one set of the ducts. Mesonephric ducts become dominant in males; paramesonephric ducts become dominant in females. This is the first gender change that occurs. Gender is determined by the presence of an XX or XY pair of chromosomes; none are destroyed. External genitalia are usually not visible before 12 weeks of gestation, when androgens begin to stimulate their growth. Spermatogenesis occurs in puberty in boys; oogenesis begins sometime after 10 weeks of gestation when the ovaries begin to develop.

Answer to Question 2

ANS: B, C, D, E
The cervix secretes mucus, which serves several functions: (1) lubricates the vaginal canal, (2) forms a barrier to sperm penetration into the uterus during nonfertile periods, (3) provides an easy-flowing pathway to facilitate sperm passage into the uterus during fertile periods, (4) provides an alkaline environment to facilitate the viability of sperm that have been deposited in the acidic vagina, (5) forms a solid plug called an operculum to protect a pregnancy from outside pathogens, and (6) functions as a bacteriostatic agent.