The average sperm count for men has fallen by over 50% over the last fifty years. Scientists believe that the most likely explanation is due to exposure to chemicals in the environment, such as pesticides, solvents and polychlorinated biphenols (PBCs) Many chemicals which are produced in only small amounts do not have to undergo testing for reproductive toxicity. The pictures show the seminiferous tubules within the human testis where the sperm are produced; close ups of the individual sperm within the female uterus; and finally the moment of fertilization.
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