The nurse is explaining the process of cell division during the ...

[ashley]

The nurse is explaining the process of cell division during the preembryonic period to a group of nursing students. Which describes the morula?
 
  a. Fertilized ovum before mitosis begins
  b. Double layer of cells that becomes the placenta
  c. Flattened, disk-shaped layer of cells within a fluid-filled sphere
  d. Solid ball composed of the first cells formed after fertilization

Question 2

Some of the embryo's intestines remain within the umbilical cord during the embryonic period because the:
 
  a. intestines need this time to grow until week 15.
  b. nutrient content of the blood is higher in this location.
  c. abdomen is too small to contain all the organs while they are developing.
  d. umbilical cord is much larger at this time than it will be at the end of pregnancy.

[Meganchabluk]

Answer to Question 1

ANS: D
The morula is so named because it resembles a mulberry. It is a solid ball of 12 to 16 cells that develops after fertilization. The fertilized ovum is called the zygote. The placenta is formed from two layers of cellsthe trophoblast, which is the other portion of the fertilized ovum, and the decidua, which is the portion of the uterus where implantation occurs. The flattened, disk-shaped layer of cells is the embryonic disk; it will develop into the body.

Answer to Question 2

ANS: C
The abdominal contents grow more rapidly than the abdominal cavity, so part of their development takes place in the umbilical cord. By 10 weeks, the abdomen is large enough to contain them. The intestines remain within the umbilical cord only until about week 10. Blood supply is adequate in all areas; intestines stay in the umbilical cord for about 10 weeks because they are growing faster than the abdomen. Intestines begin their development within the umbilical cord, but only because the liver and kidneys occupy most of the abdominal cavity, not because of the size of the umbilical cord.

[ashley]

Thank you

[Meganchabluk]

No problemo