If only a small volume of sperm is discharged into the vagina, an insufficient amount of enzymes might be released when sperm encounters the ovum. What would be the result for pregnancy?
1. The block to polyspermy (cortical reaction) would not occur.
2. The fertilized ovum would be unable to implant in the uterus.
3. Sperm would be unable to penetrate the zona pellucida of the ovum.
4. Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus.
3
Explanation:
1. The answer choice of the block to polyspermy (cortical reaction) not occurring is incorrect because it is mediated by release of materials from cortical granules below the ovum's surface and not the result of low sperm count.
2. With a low sperm count it is unlikely that the ovum would be fertilized.
3. 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.
4. "Peristalsis of the fallopian tube would decrease, making it difficult for the ovum to enter the uterus" is an incorrect statement.
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