Question

Prenatal Development:

True or False

Fertilization usually takes place in the fallopian tube.

As many as 50 percent of zygotes do not survive in the first 2 weeks.

During the period of the fetus, the most rapid prenatal changes take place.

At first, the nervous system develops the fastest.

In the second month of pregnancy, the eyes, ears, nose, jaw, and neck form.

The period of the fetus is the longest prenatal period.

Brain weight doubles form the 20^th week until birth.

The age of viability occurs sometime between 22 and 26 weeks.

By 28 weeks, fetuses are awake about 30 percent of the time.

Higher fetal activity in the last weeks of pregnancy predicts a more passive infant in the first month of life.

Answer 1

• TRUE-A pregnancy starts with fertilization, when a woman's egg joins with a man's sperm. Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.
• TRUE-As many as 50 percent of zygotes do not survive in the first 2 weeks.
• FALSE-During the period of the fetus, the most rapid prenatal changes take place.
• Period of the Embryo-Last half of the first month, implantation through the 8th week of pregnancy. Most rapid prenatal changes take place during this time period.
• TRUE-At first, the nervous system develops the fastest.At the beginning of the embryonic period, the nervous system develops fastest.
• TRUE-In the second month of pregnancy, the eyes, ears, nose, jaw, and neck form.
• TRUE-The period of the fetus is the longest prenatal period.
• FALSE-Brain weight doubles form the 20th week until birth.
• FALSE-By 28 weeks, fetuses are awake about 30 percent of the time.
• TRUE-The age of viability occurs sometime between 22 and 26 weeks.
• TRUE-Higher fetal activity in the last weeks of pregnancy predicts a more passive infant in the first month of life.