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Characteristics of sperm

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Rua Leandro Dupret , Conj. Ninety-six Tanner stage 5 and thirty-one Tanner stage 4 adolescents were evaluated: testicular volume was measured using a Prader orchidometer, and semen analysis was performed according to standard procedures. Median testicular volume was No significant differences were found in sperm volume or motility.
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Sperm characteristics in a sample of healthy adolescents in São Paulo, Brazil

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Editor-in-Chief: Prof. View Editorial Office. Submit your paper Instructions for Authors Archive. Kumar 1 ,. Saxena 1 ,. Naqvi 1.
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Full Text Introduction Infertility is common among couples of child bearing age. Approximately half of known causes of primary infertility are attributable to male factor 1, 2. However the etiology of male factors infertility is poorly understood. While some individuals may be genetically predisposed to be sub-fertile 3 , there are major epigenetic factors which are implicated as potential causes of male infertility. The male reproductive system is known to be highly sensitive to many chemicals and drugs which have been found to pose adverse effects on male reproductive capacity under certain conditions 4.
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All rights reserved. Sperm whales' heads are filled with a mysterious substance called spermaceti. Scientists have yet to understand its function, but believe it may help the animal regulate its buoyancy. They have the largest brain of any creature known to have lived on Earth. Their heads also hold large quantities of a substance called spermaceti.
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