Graticular screen showing low human sperm count
Bildnummer 11863622
| Low sperm count (second of 2 images). Graticular screen showing a field of human sperm occurring in abnormally low numbers. Screen lines assist in the counting of sperm. Here,60-70 million sperm per millilitre of ejaculate are seen; a normal count is about 113 million sperm per ml. Worldwide research on male fertility suggests sperm counts in men have declined from the 1930s to today. Studies in America,Britain,Europe and elsewhere have recorded a decrease in the total sperm count and sperm motility in men. Further research,how- ever,is needed. Lower sperm counts may be due to smoking,pesticides and other man-made chemicals. (See photo M865/103 showing a normal sperm count) | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / King-Holmes, James |
| Bildgröße: | 4180 px × 4252 px |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Restrictions: | - |
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