Question 1

The structure that contains two arteries and one vein,and connects the developing embryo to the mother's body,is called the:

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Question 2

Tara has just entered the fetal period.Therefore,it has been _____ months since conception.

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Question 3

The embryo's _____ develops into the digestive and respiratory systems.

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Question 4

Which of the following substances is a large molecule that would NOT be able to pass through the placental wall?

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Question 5

By the end of the fourth month of pregnancy,the fetus measures approximately _____ inches.

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Question 6

Sidney is expecting her first child.She has recently begun to feel the fetus kicking.Sidney's current stage of pregnancy would fall under which of the following periods of prenatal development?

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Question 7

Which of the following is a small molecule that would be able to pass through the placental wall?

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Question 8

The _____ is a layer of the embryo,which will become the nervous system and brain,sensory receptors,and skin parts.

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Question 9

The _____ consists of a group of tissues in which small blood vessels from the mother and offspring intertwine,but do not connect.

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Question 10

During the fourth week of prenatal development,the urogenital system becomes apparent,and _____ emerge.

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Question 11

The outermost layer of the embryo is called the:

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Question 12

During pregnancy,which of the following organs or systems are the first to develop?

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Question 13

The middle layer of the embryo is called the:

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Question 14

The _____ prevents large molecules like red blood cells and harmful substances,such as most bacteria and maternal wastes,from entering the fetus.

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Question 15

The life-support systems for the embryo include the:

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Question 16

The _____ is like a bag or envelope,and contains a clear fluid in which the developing embryo floats.

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Question 17

The process of organ development during the first two months of prenatal development is known as:

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Question 18

The _____ is a layer of the embryo,which will become the circulatory system,bones,muscles,excretory system,and reproductive system.

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