TOXINS - FetalGrowthand Development . ANDENVIRONMENTAL...

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Fetal Growth and  Development . AND ENVIRONMENTAL  TOXINS!
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Spermatogenesis The process of making sperm.
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Oogenesis The process of making eggs.
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The release of an egg (ova). 14 days after the onset of menses. Production of progesterone tells her body that she is  “pregnant.” Ovulation
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LH (Luteinizing hormone) Stimulates ovulation, progesterone secretion, mammary glands, and male  testosterone secretion. FSH (Follicle stimulating hormone) Stimulates follicle development, and other sex hormones. Estrogen Class of hormones secreted from the ovarian follicle. Considered the main “female” hormones. Progesterone Maintains endometrium during pregnancy. Female sex hormones
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Female hormonal regulation.
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Are you pregnant? What is “pregnant?” If you had sex on Friday February 14th… Fertilized on Wednesday February 23rd? Implantation on Saturday March 1st? When did you “become” pregnant? When do you find out you are pregnant? Ok… so you have had sex…
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Fertilization The production of a zygote. How does the egg get  fertilized? Where does fertilization  take place? How long does it take?
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Steps during fertilization: Sperm approaches egg. Sperm releases enzymes. Sperm bonds with ova. Ova membrane changes.
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Gestation “The condition of carrying a developing baby within  the uterus.” How long is a pregnancy? 266 days (38 weeks) Mice (29 days) Elephants (22 months) What is the average size of a baby? 50 cm (20 inches) and 2.7 – 4.5 kg (6-10 lbs).
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What happens in the first month? The zygote splits every  20 minutes. In three hours, a single  ball of cells forms. This continues to divide  for three more days.
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Step 1: Zygote   Blastula Formation of a  hollow ball of cells. This is completed by  day 5.
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Step 2: Blastula   Gastrula The tissues migrate,  becoming quite  different. Ectoderm NS and skin Mesoderm Heart, kidney Endoderm Digestive tract
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Changes in the gastrula:
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The placenta.
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Fully formed at 31 days. Movement of nutrients and waste products.
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This note was uploaded on 12/08/2011 for the course HES 1 taught by Professor Dianeolin during the Fall '11 term at Riverside Community College.

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TOXINS - FetalGrowthand Development . ANDENVIRONMENTAL...

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