Presentation on theme: "Pregnancy: When male gametes are deposited into a woman’s vagina, they swim first toward the uterus, then the fallopian tubes. Of the several million spermatozoa."— Presentation transcript:
Pregnancy: When male gametes are deposited into a woman’s vagina, they swim first toward the uterus, then the fallopian tubes. Of the several million spermatozoa released, only a few thousand will reach the ovum (see below). Only one of these will succeed in fertilizing the ovum. Book A = 266 Book B = 262
Embryo and Placenta: Two important tissues form in the 10th and 14th day of development: 1. The Amniotic Sac that contains the embryo and the amniotic fluid; they protect the embryo from shock. 2. The Placenta; it carries the oxygen and nutrients for cell growth and waste removal. Week 1 – 9 Pregnancy Video Week 1 – 9 Pregnancy Video
Embryo to Fetus Three layers of Gastrula form in the Zygote; Cell layers to create the different parts of the body: Cell Differentiation. The embryo grows very quickly; 500 X bigger by the 4 th week. (sesame seed to grape). From this point on the growth of the embryo will grow into a fetus. Time is now broken into Trimesters.
Week Embryo or Fetus Key Aspects Week 4 Week8 Week 12 Week 10 – 14 Video Week 10 – 14 Video
Week Embryo or Fetus Key Aspects Week 4 Live is in the form of an embryo at 28 days. It measures 1 cm long. Brain, heart, limbs, eyes and spinal column start to form. Week8 Baby is now considered a fetus. 3 cm long. 1 st bone cells produced. Arms and legs – no digits. Week 12 Fetus: it can move.8 – 10 cm long. Sprouting Organs: Liver, stomach, brain & heart. Sex determined and Week 10 – 14 Video Week 10 – 14 Video
K E Y A S P E C T S Week 16 Week 20 Week 24 Week 15 – 20 Week 15 – 20 Week 21 – 27 Week 21 – 27 Week
K E Y A S P E C T S Week 16 Week 20 Week 24 Fetus is ~ 16 cm long. Skeleton forms Fingers and toes; nails start to grow Genital organs form Brain develops quick and nervous sys. starts to work Most organs present, but no functioning. 25 – 30 cm Hair on head starts Teeth buds under gums Starts to hear sounds Can suck thumb Digestive system starts by swallowing amniotic fluid. 27- 35 cm Lungs form, but not able to breath. Finger prints develop Jumps when sudden noise made Week 15 – 20 Week 15 – 20 Week 21 – 27 Week 21 – 27 Week
28 – 37 Week 28 – 37 Week K E Y A S P E C T S Week 28 Week 32 Week 36
Week 28 – 37 Week 28 – 37 Week K E Y A S P E C T S Week 28 Week 32 Week 36 ~ 38 cm long Immune system develops Bones begin to harden It can open its eyes ~ 42 cm long Grows about 1 cm a week Lungs and Brand continue to develop Fetus is running out of room inside Head starts to drop into birth position. ~ 50 cm long Can distinguish light and dark Recognizes mother’s voice Nails/Hair continue to grow. Get hiccups often.
Risk Questions. Risk Questions. Which Trimester and Week does… 1.The heart start to develop? 2.The lower limbs stop developing? 3.A) It become a major risk to have major malformations to the exterior genitalia? 4.B) It become only possible minor malfunctions to the exterior genitalia?
Your consent to our cookies if you continue to use this website.