30.4.1%20Fetal%20Development%20-R

30.4.1%20Fetal%20Development%20-R - embryo = ball of cells...

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3.4.1 Fetal Development
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Stages in Human Life Span 1. growth and development  infancy   (0- 12 mths) childhood (1-3: 4- 8yrs) adolescence (9-13; 14- 18yrs) pregnancy & lactation
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Stages in Human Life Span 2. maturation   young  adults (19-30 yrs) 3. senescence  middle  aged (31-50yrs)  older adults  (51-70; 70+yrs)
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Prior to Conception Males:   40% infertility in couples lies with  male  low sperm count  low sperm motility A single sperm
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Prior to Conception Improve sperm production   eat well balanced diet  RDAs – Vit C, Vit E, Selenium, Zinc   reduce alcohol intake; stop smoking;  stop anabolic steroids  include some physical activity
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Prior to Conception Women:    achieve and maintain a healthy  body weight  eat a well balanced diet  avoid alcohol, cigarettes and other  harmful substances  include some physical activity
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Early Development   ovum +  sperm = zygote
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Unformatted text preview: embryo = ball of cells called a blastocyst implants in uterus 7-14 days after fertilization Early Development following implantation in the uterus a placenta begins to develop Placenta Structure Fig 14.4 Functions of the Placenta transfer nutrients, oxygen and hormones from mother to fetus remove metabolic waste from fetus processed by mother produces hormones to maintain the pregnancy [Amniotic fluid cushions the fetus] Critical Periods of Development Fig 14.3 Teratogens and Birth Defects umbrella term for substances that negatively affect development thalidomide (1950s/1960s) (acne medication) alcohol cigarette smoke Critical Periods of Development New Research chronic disease in later life fetal programming...
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30.4.1%20Fetal%20Development%20-R - embryo = ball of cells...

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