This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which is the purpose of the ovum's zona pellucida? a. Prevents multiple sperm from fertilizing ... (Read 92 times)

nautica902

  • Hero Member
  • *****
  • Posts: 591
on: Jun 28, 2018
Which is the purpose of the ovum's zona pellucida?
 
  a. Prevents multiple sperm from fertilizing the ovum
  b. Stimulates the ovum to begin mitotic cell division
  c. Allows the 46 chromosomes from each gamete to merge
  d. Makes a pathway for more than one sperm to reach the ovum

Question 2

One of the assessments performed in the birth room is checking the umbilical cord for blood vessels. Which finding is considered to be within normal limits?
 
  a. One artery and one vein
  b. Two veins and one artery
  c. Two arteries and one vein
  d. Two arteries and two veins


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jessicaduplan

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jun 28, 2018
Answer to Question 1

ANS: A
Fertilization causes the zona pellucida to change its chemical composition so that multiple sperm cannot fertilize the ovum. Miotic cell division begins when the nuclei of the sperm and ovum unite. Each gamete (sperm and ovum) has only 23 chromosomes; there will be 46 chromosomes when they merge. Once sperm has entered the ovum, the zona pellucida changes to prevent other sperm from entering.

Answer to Question 2

ANS: C
The umbilical cord contains two arteries and one vein to transport blood between the fetus and the placenta. Any option other than two arteries and one vein is considered abnormal and requires further assessment. Two veins and one artery is abnormal and may indicate an anomaly. Two arteries instead of one is considered normal; this infant would require further assessment for other anomalies.


nautica902

  • Member
  • Posts: 591
Reply 2 on: Jun 28, 2018
:D TYSM

Alyson.hiatt@yahoo.com

  • Member
  • Posts: 354
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Testing the effects of long-term fertilizing on inter-actions between mycorrhizal fungi and plants o Testing the effects of long-term fertilizing on inter-actions between mycorrhizal fungi and plants o
Multiple crossovers can include more than two chromatids Multiple crossovers can include more than two chromatids
Multiple crossovers can include more than two chromatids Multiple crossovers can include more than two chromatids
Sperm by the fallopian tube Sperm by the fallopian tube
The winning sperm The winning sperm
Sperm penetration of ovum Sperm penetration of ovum
Video: Protein Structure - Primary, Secondary, Tertiary and Quaternary

For a complete list of videos, visit our video library