Title: The Fetal Period of Pregnancy: Definition & Development - Video & Lesson Transcript | Study.com
Headings: The Fetal Period of Pregnancy: Definition & Development
The Fetal Period of Pregnancy: Definition & Development
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The Fetal Stage of Pregnancy
What Happens During the Fetal Stage?
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Content: The skeleton of the fetus is, at this point, primarily cartilage, or soft connective tissue, but may also contain some hardened bone. This is also the period where the liver and pancreas, both accessory digestive organs, will begin secreting enzymes and hormones within the fetus. By week 19, the heartbeat of the fetus can be detected clearly with a stethoscope. From there, the lungs and alveoli, or air sacs, will develop around week 23 as the respiratory system continues to form. Another development that starts around this time is the integration of nervous system control over the body functions. By week 31, the fetus will continue to develop, but the foundations for almost all tissues and systems have been established. The remaining weeks of pregnancy will be marked by further development in the respiratory system, including surfactant production in the lungs, which reduces alveoli collapse and increased growth of body fat. Finally, between weeks 36 and 40, the fetus has an increased chance of survival and is considered to be 'full-term' due to the amount of development that has taken place. The fetal stage ends when the mother enters labor and the child is delivered. One important factor to note: