Chapter 4: Human Reproduction
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Transcript of Chapter 4: Human Reproduction
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Chapter 4: Human Reproduction
4.7 – Reproductive Technologies
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Reasons for conception troubles
• Man might not produce enough healthy sperm
• Oviducts f woman may be blocked
• One ovary might not be properly functioning
• Hormones might not be in proper amounts in woman’s body
• So, there are technologies to help!
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Fertility Drugs
• These drugs help woman’s body to release more eggs because of hormones.
• More eggs released means a greater likelihood of getting pregnant.
• Often results in twins, triplets…
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Artificial Insemination
• Usually a medical procedure where sperm is introduced into female’s reproductive tract.
• Why do this?
• If male has low sperm count, sperm can be collected over time and then used.
• If male produces no sperm, can use donor sperm from sperm bank
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Intrauterine Insemination
• Similar to artificial insemination, but sperm placed into uterus, not vagina.
• More effective in that more sperm will survive to reach the egg. (shorter distance)
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Gamete Intrafallopian Transfer
• GIFT
• Female’s eggs removed from ovary and reinserted into oviduct with sperm.
• Oviduct is the place of fertilization therefore, increased chance of fertilization
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In Vitro Fertilization
• IVF – fertilization takes place in petri dish in a lab
• “test-tube babies”
• How?
• Follicles of immature eggs removed and allowed to mature
• Sperm cells from father added once eggs are mature
• Embryos then inserted back into mother at correct time in cycle. Several embryos means possibility of multiple births.
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In Vitro Fertilization
• If mother cannot accept embryos for whatever reason, a surrogate mother can be used.
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Intracytoplasmic Sperm Injection
• ICSI
• One sperm inserted directly into a mature egg
• Used when IVF not effective
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Misconception
• Test-tube babies are an easy way to have children
• These technologies are very successful
• Infertility usually fault of female
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Misconception
• These tests take lots of planning, monitoring (cycles), need to take drugs at certain times,
• Only a 15%-20% success rate
• Statistically: 50% due to female, 50% due to male
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Practice
• CYU 4.7 – p136 #8 (may need book) 11, 12, 14, 16