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Flashcards in Ch 3 Test 1 Deck (14)
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The period of a prenatal development that takes place in the first two weeks after conception

Germinal period

1

The inner mass of cells that develops during the germinal period

Blastocyst

2

The outer layer of cells that develops in the germinal period

Trophoblast

3

The period of prenatal development that occurs two to eight weeks after conception

Embryonic period

4

The inner layer of cells which develops into digestive and respiratory

Endoderm

5

The middle layer of cells which becomes the circulatory system, bones, muscles, excretory system and reproductive system

Mesoderm

6

The outermost layer of cells which becomes the nervous system and brain, sensory receptors and skin parts

Ectoderm

7

The life-support system that is a thin bag or envelope that contains a clear fluid in which the developing embryo floats

Amnion

8

Contains two arteries and one begin and connects the baby to the placenta

Umbilical cord

9

A disk shaped group of tissue in which small blood vessels from the mother and the offspring intertwine but don't join

Placenta

10

The prenatal period of development that begins two months after conception and lasts for seven months on average

The fetal period

11

Generation of new neurons

Neurogenesis

12

How much weight is healthy for a woman to gain in pregnancy

25-35 pounds

13

And agent that can potentially cause a physical birth defect

Teratogen