1 / 16

Do Now

Do Now. Do you know the difference between an embryo and a fetus? Where have you heard those words before?. Reproductive System. Fertilization. Trimesters. Three sections of pregnancy Usually ~3 months each. Section 38.2 Summary – pages 1005-1011. First trimester: Organ systems form.

mairi
Download Presentation

Do Now

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Do Now • Do you know the difference between an embryo and a fetus? Where have you heard those words before?

  2. Reproductive System Fertilization

  3. Trimesters • Three sections of pregnancy • Usually ~3 months each

  4. Section 38.2 Summary – pages 1005-1011 First trimester: Organ systems form • During the first trimester, all the organ systems of the embryo begin to form. • During this time of development, the woman may not even realize she is pregnant.

  5. Section 38.2 Summary – pages 1005-1011 First trimester: Organ systems form • Seven weeks: Sensitivity • Alcohol • Tobacco • Other drugs

  6. Section 38.2 Summary – pages 1005-1011 First trimester: Organ systems form • By the eighth week, all the organ systems have been formed, and the embryo is now referred to as a fetus.

  7. Section 38.2 Summary – pages 1005-1011 First trimester: Organ systems form • At the end of the first trimester, the fetus weighs about 28 g and is about 7.5 cm long from the top of its head to its buttocks.

  8. Section 38.2 Summary – pages 1005-1011 Second trimester: A time of growth • Growth is rapid during the fourth month, but then slows by the beginning of the fifth month. • During the fifth month, fetal movements can be felt by the mother. In the sixth month of development, the fetus’s eyes open and eyelashes form.

  9. Section 38.2 Summary – pages 1005-1011 Second trimester: A time of growth • At this point, it is possible for the fetus to survive outside the uterus, but it would require a great amount of medical assistance, and the mortality rate is high. • The fetus’s metabolism cannot yet maintain a constant body temperature, and its lungs have not matured enough to provide a regular respiratory rate.

  10. Section 38.2 Summary – pages 1005-1011 Second trimester: A time of growth Growth of a Fetus Source of Sample Time After Fertilization Size 3 weeks 3 mm First trimester • By the end of the second trimester, the fetus weighs about 650 g and is about 34 cm long. 4 weeks 6 mm 6 weeks 12 mm 7 weeks 2 cm 8 weeks 4 cm 9 weeks 5 cm 3 months 7.5 cm 4 months 15 cm Second trimester 5 months 25 cm 6 months 30 cm 35 cm 7 months Third trimester 8 months 40 cm 51 cm 9 months

  11. Section 38.2 Summary – pages 1005-1011 Third trimester: Continued growth • During the last trimester, the mass of the fetus more than triples. • During the eighth month, fat is deposited beneath the skin, which will help insulate the newborn.

  12. Section 38.2 Summary – pages 1005-1011 Third trimester: Continued growth • During the final weeks of pregnancy, the fetus grows large enough to fill the space within the embryonic membranes. • The fetus weighs about 3300 g and is about 51 cm long.

  13. Section 38.2 Summary – pages 1005-1011 Third trimester: Continued growth • All of its body systems have developed, and it can now survive independently outside the uterus.

  14. Section 38.2 Summary – pages 1005-1011 Genetic disorders can be predicted • Advances in the field of genetics have allowed scientists to identify genes that carry certain genetic disorders, such as cystic fibrosis, Huntington’s disease, and Tay-Sachs disease.

  15. Section 38.2 Summary – pages 1005-1011 Genetic disorders can be predicted • Early identification or detection of certain genetic disorders, such as phenylketonuria (PKU) and cystic fibrosis, is essential to the treatment of these disorders. • As services, such as genetic counseling, become more available, some people may consider visiting a genetic counselor to discover additional information about their genetic makeup before having children.

  16. What to Expect When You’re Expecting • Create a brochure for an expectant parent • It should go through the progress that their baby will be making throughout the nine months of pregnancy

More Related