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Lesson 1 Did you know that your body is made of trillions of cells? Your heart, lungs, skin, bones, and other body organs all began as a single cell that.

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Presentation on theme: "Lesson 1 Did you know that your body is made of trillions of cells? Your heart, lungs, skin, bones, and other body organs all began as a single cell that."— Presentation transcript:

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2 Lesson 1 Did you know that your body is made of trillions of cells? Your heart, lungs, skin, bones, and other body organs all began as a single cell that is smaller than the period at the end of this sentence. The Beginning of the Life Cycle

3 Lesson 1 In this lesson, youll learn to: Explain fetal development from conception through pregnancy and birth. Recognize how nutrients and other substances are transferred from a pregnant female to her fetus. Lesson Objectives

4 Lesson 1 Fertilization The entire complex human body begins as one microscopic cell that is formed by fertilization.fertilization The resulting cell is called a zygote. Within a day after the zygote forms, it begins dividing as it travels down the fallopian tube. Conception and Implantation

5 Lesson 1 Implantation Conception and Implantation By the time it reaches the uterus, the zygote has divided many times to form a cluster of cells. After implantation of the zygote, the cluster of cells is known as an embryo.implantation embryo Click image to view movie.

6 Lesson 1 Embryo Click image to view movie. Conception and Implantation

7 Lesson 1 Structures Formed During Embryonic Growth As the embryo grows, its cells continue to divide, forming three tissue layers that later become various body systems. During this time, two important structures form outside the embryo: 1.Amniotic sacAmniotic sac 2.Umbilical cordUmbilical cord Embryonic Growth

8 Lesson 1 Substances Passed to the Embryo Although the blood supply of the mother and the developing embryo are kept separate, materials diffuse from one blood supply to the other through the umbilical cord. Nutrients and oxygen pass from the mothers blood to the embryo, and wastes from the embryo diffuse into the mothers blood. If a pregnant female uses harmful substances, they can cross the placenta and harm the developing embryo.placenta Embryonic Growth

9 Lesson 1 Trimesters The time from conception to birth is usually about nine full months. These nine months are divided into three 3-month periods called trimesters. During the period of growth in the uterus, the fetus develops in preparation for living outside the mothers body.fetus Fetal Development

10 Lesson 1 First Trimester – 0-14 Weeks In the first trimester, the fetus develops a human profile. By week 12 the fetus makes crying motions but no sound and may suck its thumb. Fetal Development

11 Lesson 1 Second Trimester – Weeks In the second trimester, the fetus can hear conversations and has a regular cycle of waking and sleeping. Weight increases rapidly. Fetal Development

12 Lesson 1 Third Trimester – 29 Weeks to Birth In the third trimester, the fetus uses all five senses and begins to pass water from the bladder. Fetal Development

13 Lesson 1 Changes Experienced During Labor Many females experience weak, irregular muscular contractions of the uterus for weeks or even months before the baby is born. As the time approaches for the baby to be born, however, these contractions become regular, stronger, and closer together. The stronger contractions induce labor.labor Stages of Birth

14 Lesson 1 Stages of Labor Stages of Birth Stage 3: Afterbirth Stage 1: Dilation Stage 2: Passage through birth canal

15 Lesson 1 Q. The union of a male sperm cell and a female egg cell is called _________. 1.zygote 2.implantation 3.fertilization 4.labor Choose the appropriate option. Quick Review

16 Lesson 1 A. The union of a male sperm cell and a female egg cell is called fertilization. Click Next to attempt another question. Quick Review - Answer

17 Lesson 1 Q. The zygote attaches to the uterine wall in the process called _________. 1.labor 2.implantation 3.fertilization 4.cell division Choose the appropriate option. Quick Review

18 Lesson 1 A. The zygote attaches to the uterine wall in the process called implantation. Click Next to attempt another question. Quick Review - Answer

19 Lesson 1 Provide a short answer to the question given below. Click Next to view the answer. Q. How is a developing fetus nourished? Quick Review

20 Lesson 1 A. Nutrients from the mother pass to the developing fetus through the blood in the umbilical cord. Click Next to attempt another question. Quick Review - Answer

21 Lesson 1 Explain how harmful substances taken in by a pregnant female can be transferred to a developing fetus. How might fetal development be affected? Provide a suitable explanation. Quick Review

22 Lesson 1 A. Correct! The union of a male sperm cell and a female egg cell is called fertilization. Click Next to attempt another question. Quick Review - Answer

23 Lesson 1 You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer. Quick Review - Answer

24 Lesson 1 A. Correct! The zygote attaches to the uterine wall in the process called implantation. Click Next to attempt another question. Quick Review - Answer

25 Lesson 1 You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer. Quick Review - Answer

26 Lesson 1 Stages of Labor Stages of Birth Stage 3: Afterbirth Stage 1: Dilation Stage 2: Passage through birth canal

27 Lesson 1 Stages of Labor Stages of Birth Stage 3: Afterbirth Stage 1: Dilation Stage 2: Passage through birth canal

28 Lesson 1 The entire complex human body begins as one microscopic cell that is formed by fertilization.fertilization The resulting cell is called a zygote. Within a day after the zygote forms, it begins dividing as it travels down the fallopian tube. Fertilization The union of a male sperm cell and a female egg cell is called fertilization. Conception and Implantation

29 Lesson 1 By the time it reaches the uterus, the zygote has divided many times to form a cluster of cells. After implantation of the zygote, the cluster of cells is known as an embryo.implantation embryo Click image to view movie. Implantation The zygote attaches to the uterine wall in the process called implantation. Conception and Implantation

30 Lesson 1 By the time it reaches the uterus, the zygote has divided many times to form a cluster of cells. After implantation of the zygote, the cluster of cells is known as an embryo.implantation embryo Click image to view movie. Implantation The cluster of cells that develop between the third and eighth weeks of pregnancy is called an embryo. Conception and Implantation

31 Lesson 1 Structures Formed During Embryonic Growth As the embryo grows, its cells continue to divide, forming three tissue layers that later become various body systems. During this time, two important structures form outside the embryo: 1.Amniotic sacAmniotic sac 2.Umbilical cordUmbilical cord The amniotic sac is a thin, fluid- filled membrane that surrounds and protects the developing embryo. Embryonic Growth

32 Lesson 1 Structures Formed During Embryonic Growth As the embryo grows, its cells continue to divide, forming three tissue layers that later become various body systems. During this time, two important structures form outside the embryo: 1.Amniotic sacAmniotic sac 2.Umbilical cordUmbilical cord The umbilical cord is a ropelike structure that connects the embryo and the mothers placenta. Embryonic Growth

33 Lesson 1 Substances Passed to the Embryo Although the blood supply of the mother and the developing embryo are kept separate, materials diffuse from one blood supply to the other through the umbilical cord. Nutrients and oxygen pass from the mothers blood to the embryo, and wastes from the embryo diffuse into the mothers blood. If a pregnant female uses harmful substances, they can cross the placenta and harm the developing embryo.placenta The placenta is a thick, blood-rich tissue that lines the walls of the uterus during pregnancy and nourishes the embryo. The placenta is a thick, blood-rich tissue that lines the walls of the uterus during pregnancy and nourishes the embryo. Embryonic Growth

34 Lesson 1 Trimesters The time from conception to birth is usually about nine full months. These nine months are divided into three 3-month periods called trimesters. During the period of growth in the uterus, the fetus develops in preparation for living outside the mothers body.fetus After about the eighth week, the developing group of cells is called a fetus. Fetal Development

35 Lesson 1 Many females experience weak, irregular muscular contractions of the uterus for weeks or even months before the baby is born. As the time approaches for the baby to be born, however, these contractions become regular, stronger, and closer together. The stronger contractions induce labor.labor Changes Experienced During Labor Labor is the final stage of pregnancy in which the uterus contracts and pushes the baby out of the mothers body. Stages of Birth


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