Human Biology: Concepts and Current Issues Plus Mastering Biology with Pearson eText -- Access Card Package (8th Edition)
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Chapter 21, Problem 8TY
Summary Introduction

Introduction:

Prenatal development is the process that involves the development of the embryo into the fetus during the gestation period. The process of prenatal development begins with the fertilization and persists until the birth of an infant.

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All of the following events occur by the end of the eighth week of gestation EXCEPT Select one: a. the limb buds form distinct fingers and toes, and the face can be seen b. the heart begins to pump, and red blood cells are formed in the liver c. the reproductive structures have formed, and the gender of the baby can be determined through ultrasound d. lungs and kidneys have formed
Identify a characteristic of a fetus in the sixth month of gestation. a. It weighs between 5 and 7 pounds. b. It can open and close its eyes and look in all directions. c. It has fully developed reflex patterns. d. It has a respiratory system that is adequate to survive outside the womb.
Which of the following statements regarding prenatal development risks is FALSE? a. Cigarette smoking by women has serious adverse effects on prenatal and child development b. Paternal factors can adversely affect prenatal development c. Maternal nutritionplays little role in prenatal development
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