powerpoint _2 - Heredity, prenatal development and birth

powerpoint _2 - Heredity, prenatal development and birth -...

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Unformatted text preview: Prenatal development: Conception • Ova – largest cell in the human body – Once every 28 days ovum bursts from one of ovaries and is drawn into the fallopian tubes • Sperm – 300 million sperm produced each day – Only 300 to 500 sperm reach the ovum – Sperm can survive for 6 days • http:// www.pbs.org/wgbh/nova/miracle/program Prenatal development: The Germinal Stage • http://www.pbs.org/wgbh/nova/miracle/program.html • The Zygote • 1 st two weeks • Before implantation • Implantation – Occurs between the 7 th and 9 th days – Burrows into uterine lining – As many as 30% of zygotes do not survive this period • The placenta and umbilical cord – The placenta begins development – Cord brings nutrition to and from baby Prenatal development: Embryonic Stage • http://www.pbs.org/wgbh/nova/miracle/program • Implantation until 8 th week • Most rapid change during this time – Especially vulnerable • The second month – Growth continues rapidly – Tiny buds become arms, legs, fingers, and toes – Organogenesis – Responds to touch – Can move and it can sense the world Critical thinking break...
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This note was uploaded on 05/24/2011 for the course PSY 104 taught by Professor Lauralauzen-collins during the Spring '11 term at Moraine Valley Community College.

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powerpoint _2 - Heredity, prenatal development and birth -...

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