Child and Adolescent Psychology

Once in the uterus, the zygote

• stops dividing into more cells.

• becomes implanted immediately.

• wanders around for 3 or 4 days before becoming implanted.

• is now called a fetus.

Within 36 hours after conception, the zygote consists of cells.

• 2

• 36

• hundreds of

• several thousand

The embryonic disk is part of the that eventually becomes the embryo.

• blastocyst

• trophoblast

• placenta

• sperm cell

Prior to implantation, how are the developing cells that will become the fetus nourished?

• Nourishment is not necessary at this stage of development.

• From the umbilical cord and through the placenta

• From the yolk of the original egg cell

• From the endoderm of the blastocyst

Which of the following does NOT develop from the four membranes of the trophoblast?

• Zygote

• Amniotic sac

• Umbilical cord

• Placenta

Nina says that a newly fertilized egg cell cannot survive without nourishment from the mother. Carole says that the fertilized egg cell is nourished by the yolk of the ovum and gains mass before implantation. Sarah says that the fertilized egg cell only gains mass after implantation. Which person is correct?

• Nina only

• Carole only

• Sarah only

• Nina and Sarah are correct, but Carole is not.

Prema has read many books about pregnancy. Each gives a different estimate for how many pregnancies end in miscarriage. Given what you know from your text, which estimate is MOST accurate?

• About 50%

• About 33%

• Less than 10%

• About 75%

If a fetus's spine develops before its fingernails, this represents proximodistal development, characterized by

• growth spreads outward from the spine.

• development from the head down.

• at birth, the head is oversized in comparison to the body.

• upward from the trunk toward the brain.

If a fetus's upper arms develop before the lower forearms, this is called cephalocaudal development and is characterized by

• growth spreads outward from the spine.

• development from the head down.

• inner organs grow faster than the extremities.

• upward from the trunk toward the brain.

Given the cephalocaudal pattern of development, which of the following should happen first?

• Development of the sensory systems

• Growth of the hands and feet

• Development of the brain and spinal cord

• Development of the kidneys and liver