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Unformatted text preview: The Disappearing Male- In the last 50 years, sperm counts worldwide have been cut in half- Rates of male infertility and sperm abnormalities have increased while testicular cancer rates have doubled- Belief for this cause is manmade chemicals that interfere with male hormonal system- 90000 manmade compounds developed in last 60 years which of many have not been tested on humans- Bisphenol A makes plastic hard while phthalates make plastics soft- A typical young man produces half the sperm his father did while 85% of it is abnormal- WHO standard for classifying men for being infertile have dropped (now at 20 million per millilitre)- Three things used to assess sperm quality: volume (sperm count), speed (motility), morphology- Male alligators in the lakes of Florida, have sexual organs that are of their normal size and 1/3 reproduction rate is 90% below average- Abnormality of the testes related to low testosterone levels similar to females and had...
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This note was uploaded on 02/08/2011 for the course ECON 1B03 taught by Professor Hannahholmes during the Summer '08 term at McMaster University.
- Summer '08