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Nutrition Through the Life Cycle (...

6th Edition
Judith E. Brown
ISBN: 9781305628007

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BuyFindarrow_forward

Nutrition Through the Life Cycle (...

6th Edition
Judith E. Brown
ISBN: 9781305628007
Textbook Problem

_____ Which of the following statements about “critical periods” of growth and development is true?

  1. a. Critical periods are defined as specific time periods early in pregnancy when toxins that may harm fetal growth and development are able to pass through the placenta to the fetus.
  2. b. It is possible to reverse ill effects of adverse nutrition exposures on fetal growth and development by eliminating the adverse nutritional exposure later.
  3. c. The most intense period of fetal tissue and organ growth and development is in the third trimester of pregnancy.
  4. d. Critical periods of growth and development are characterized by hyperplasia, or an increase in cell multiplication.

Summary Introduction

Introduction: Critical period in pregnancy is during 10-20 weeks of gestation when fetal organs begin to form. It is the time when rapid multiplication and differentiation of fetal cells occur. During this time once the fetal cells forms, it is very difficult to reprogram them. Therefore, during this time it is critical for the mother to maintain a healthy nutritional balance of the body because it can have long term effects on fetal development and growth.

Explanation

Reasons for the correct answer:

Option d. is given as “Critical periods of growth and development are characterized by hyperplasia or an increase in cell multiplication”.

All the major organs of the fetus develop during the first two months of gestation therefore this is the time when the fetal cells rapidly divide and differentiate to form organs of the body. This period is very much essential for growth and development.

Hence, option d. is correct.

Reasons for incorrect answer:

Option a. is given as “Critical periods are defined as specific time periods early in pregnancy when toxins that may harm fetal growth and development are able to pass through the placenta to the fetus”. It is an incorrect statement as critical period refers to the time during gestation when fetal organ development occurs with rapid multiplication or hyperplasia...

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