Fetal Period: Development Summary 9-12 Weeks
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Questions and Answers

During which week of development does the heart become four-chambered?

  • Fifth week
  • Sixth week (correct)
  • Seventh week
  • Fourth week

What is the primary focus during the fetal period?

  • Growth and differentiation of existing tissues and organs (correct)
  • Development of new structures
  • Formation of the heart prominence
  • Rapid brain development

During which period is the fetus least vulnerable to the damaging effects of drugs, radiation, and microbes?

  • Embryonic period
  • Fetal period (correct)
  • Both periods pose equal vulnerability
  • The vulnerability varies throughout both periods

What is the approximate proportion of the full-term weight gained during the last 2.5 months of intrauterine life?

<p>One-half (D)</p> Signup and view all the answers

During which week does the rapid development of the brain occur, leading to considerable growth of the head?

<p>Fifth week (C)</p> Signup and view all the answers

What is the approximate proportion of body length occupied by the head at the beginning of the fetal period?

<p>One-half (C)</p> Signup and view all the answers

During which period do the limbs show substantial development?

<p>Sixth week (D)</p> Signup and view all the answers

What is the approximate proportion of fetal length occupied by the limbs at the end of the fetal period?

<p>One-half (C)</p> Signup and view all the answers

During which period does the neck and trunk begin to straighten?

<p>Sixth week (C)</p> Signup and view all the answers

What distinguishes the fetal period from the embryonic period in terms of development?

<p>Remarkable body growth (B)</p> Signup and view all the answers

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