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Questions and Answers
What is the percentage of sperm that make it to the site of fertilization out of 165 million?
What is the percentage of sperm that make it to the site of fertilization out of 165 million?
What percentage of sperm actually make it to the site of fertilization?
What percentage of sperm actually make it to the site of fertilization?
What is required for a man to be fertile?
What is required for a man to be fertile?
What is required for a man to be fertile?
What is required for a man to be fertile?
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What is needed to break down barriers surrounding the ovum?
What is needed to break down barriers surrounding the ovum?
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What is needed to break down barriers surrounding the ovum?
What is needed to break down barriers surrounding the ovum?
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What surrounds the ovum that the sperm must penetrate?
What surrounds the ovum that the sperm must penetrate?
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What does the sperm penetrate to reach the ovum?
What does the sperm penetrate to reach the ovum?
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What must the sperm bind with to penetrate the zona pellucida?
What must the sperm bind with to penetrate the zona pellucida?
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What must the sperm bind with to penetrate the zona pellucida?
What must the sperm bind with to penetrate the zona pellucida?
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What does fertilin on the sperm head bind with?
What does fertilin on the sperm head bind with?
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What does Fertilin on the sperm head bind with in the outer layer of the zona pellucida?
What does Fertilin on the sperm head bind with in the outer layer of the zona pellucida?
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When does the acrosome reaction occur?
When does the acrosome reaction occur?
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What occurs when the sperm head binds with ZP3?
What occurs when the sperm head binds with ZP3?
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What do acrosomal enzymes do?
What do acrosomal enzymes do?
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What do acrosomal enzymes do?
What do acrosomal enzymes do?
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What triggers the block to polyspermy?
What triggers the block to polyspermy?
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What triggers the block to polyspermy?
What triggers the block to polyspermy?
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What does fertilization combine?
What does fertilization combine?
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What does fertilization do?
What does fertilization do?
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What is the approximate number of sperm that reach the ovum?
What is the approximate number of sperm that reach the ovum?
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What does fertilization set in motion?
What does fertilization set in motion?
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What is the function of the zona pellucida?
What is the function of the zona pellucida?
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What is the purpose of acrosomal enzymes?
What is the purpose of acrosomal enzymes?
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Study Notes
- Only a few thousand out of 165 million sperm make it to the site of fertilization.
- Sperm concentration must be high for a man to be fertile.
- Acrosomal enzymes of many sperm are needed to break down barriers surrounding the ovum.
- Sperm penetrates the corona radiata and zona pellucida surrounding the ovum.
- Sperm must bind with specific binding sites on the surface of the zona pellucida to penetrate it.
- Fertilin on the sperm head binds with ZP3 in the outer layer of the zona pellucida.
- Acrosome reaction occurs when the sperm head binds with ZP3.
- Acrosomal enzymes digest the zona pellucida, enabling sperm to tunnel through.
- Sperm-egg fusion triggers block to polyspermy.
- Fertilization combines genes from two parents to form a genetically unique organism and sets in motion the development of that organism.
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