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| Scrotum |
| The pouch of skin that hangs from the lower abdominal region below the penis. |
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| Semen |
| Fluid containing the sperm and nourishing secretions that is expelled from the male reproductive system by means of ejaculation. |
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| Semen Analysis |
| A test performed on freshly ejaculated sperm to determine the count, shape, size, and ability of the sperm to move. |
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| Seminiferous tubules |
| Specialized microscopic ducts located within the testes. Immature sperm begin to mature in these tubules. |
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| Sexually Transmitted Disease (STD) |
| A reproductive health problem attributable to an infectious agent passed from one partner to another during sexual intercourse. |
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| Sperm |
| The microscopic cell that carries the male's genetic information to the female's egg the male reproductive cell the male gamete. |
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| Sperm Count |
| The number of sperm in an ejaculate. Also called sperm concentration and given as the number of sperm per milliliter. |
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| Sperm motility |
| The ability of sperm to swim. Poor motility means the sperm have a difficult time swimming toward the egg. |
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| Split-Ejaculate |
| Seminal fluid with an enhanced concentration of sperm created by splitting an ejaculated semen sample (the first half of the ejaculate contains most of the sperm). |
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| Sterility |
| An irreversible condition that prevents conception. |
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| Superovulation |
| The production of multiple eggs during a single menstrual cycle stimulated by fertility drugs. |
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