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Bellwork

Bellwork. The _______ is where the sperm are learning to swim. ___________ is when the egg is mature and the follicle ruptures . The _______ is where the egg will grow and be nourished. epididymus. Ovulation. uterus. Objective . SWBAT describe the stages of the menstrual cycle.

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Bellwork

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  1. Bellwork • The _______ is where the sperm are learning to swim. • ___________ is when the egg is mature and the follicle ruptures. • The _______ is where the egg will grow and be nourished. epididymus Ovulation uterus

  2. Objective • SWBAT describe the stages of the menstrual cycle. • SWBAT explain what happen during and after implantation of the egg.

  3. Menstrual Cycle

  4. Menstrual Cycle • Cyclic changes of endometrium • Regulated by estrogen and progesterone levels

  5. Stages of Menstrual Cycle • Menses – functional layer of endometrium is sloughed • Proliferative stage – regeneration of functional layer • Secretory stage – endometrium increases in size and gets ready for implantation

  6. Page 331 in your packet.

  7. Fertilization

  8. Days 1-4 • 1 Sperm fertilizes egg • DNA from both parents is now present and it is called a zygote (first cell of new person!)

  9. Days 5-7 • Zygote divides rapidly (cleavage)and becomes a blastocyst • ~ 100 cells • Implantation occurs, it is now called an embryo Days 8-9 Fluid

  10. Ovulation – Fertilization - Implantation

  11. After Implantation • Chorionic villi (projections of blastocyst) develop • Cooperate with uterine cells to form placenta • Embryo surrounded by amnion (fluid filled sac) • Umbilical cord forms attaching embryo to placenta

  12. Placenta • Barrier between mother/embryo • Deliver oxygen, nutrients • Produces hormones • Estrogen • Progesterone

  13. 8 Weeks • Now called a fetus • All organ systems areforming

  14. Assignment • Complete #22 in your packet, parts 1-5 • Summarize what would happen after process C • Complete #23 in your packet

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