If only a small volume of sperm is discharged into the vagina, an insufficient amount of enzymes might be released when they encounter the ovum. In that case, pregnancy would probably not result, because:
1. Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus.
2. The block to polyspermy (cortical reaction) would not occur.
3. The fertilized ovum would be unable to implant in the uterus.
4. Sperm would be unable to penetrate the zona pellucida of the ovum.
4
Rationale:
1. "Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus" is an incorrect statement.
2. "The block to polyspermy (cortical reaction) would not occur" is incorrect because a block to polyspermy indicates the ovum has been penetrated by a fertilizing sperm.
3. "The fertilized ovum would be unable to implant in the uterus" is incorrect because fertilization is unlikely to occur with a low sperm count.
4. Sperm would be unable to penetrate the zona pellucida of the ovum because it takes hundreds of acrosomes (the result of the acrosomal reaction) to rupture and release enough hyaluronic acid to clear the way for a single sperm to penetrate the ovum's zona pellucida successfully.
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