Fertilization s754

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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?

10%

0.01%

0.001% (correct)

What percentage of sperm actually make it to the site of fertilization?

50%

0.5%

0.005% (correct)

What is required for a man to be fertile?

Low sperm concentration

High sperm concentration (correct)

No sperm concentration

Moderate sperm concentration

What is required for a man to be fertile?

High sperm concentration Signup and view all the answers

What is needed to break down barriers surrounding the ovum?

Acrosomal enzymes of many sperm Signup and view all the answers

What is needed to break down barriers surrounding the ovum?

Acrosomal enzymes of many sperm Signup and view all the answers

What surrounds the ovum that the sperm must penetrate?

Corona radiata and zona pellucida Signup and view all the answers

What does the sperm penetrate to reach the ovum?

The fallopian tube Signup and view all the answers

What must the sperm bind with to penetrate the zona pellucida?

Specific binding sites on the surface of the zona pellucida Signup and view all the answers

What must the sperm bind with to penetrate the zona pellucida?

Specific binding sites on the surface of the zona pellucida Signup and view all the answers

What does fertilin on the sperm head bind with?

ZP3 in the outer layer of the zona pellucida Signup and view all the answers

What does Fertilin on the sperm head bind with in the outer layer of the zona pellucida?

ZP3 Signup and view all the answers

When does the acrosome reaction occur?

After the sperm binds with specific binding sites on the surface of the zona pellucida Signup and view all the answers

What occurs when the sperm head binds with ZP3?

Acrosome reaction occurs Signup and view all the answers

What do acrosomal enzymes do?

Digest the zona pellucida Signup and view all the answers

What do acrosomal enzymes do?

Digest the zona pellucida Signup and view all the answers

What triggers the block to polyspermy?

Sperm-egg fusion Signup and view all the answers

What triggers the block to polyspermy?

Sperm-egg fusion Signup and view all the answers

What does fertilization combine?

Genes from two parents Signup and view all the answers

What does fertilization do?

Combines genes from two parents to form a genetically unique organism Signup and view all the answers

What is the approximate number of sperm that reach the ovum?

16,500 Signup and view all the answers

What does fertilization set in motion?

Development of the genetically unique organism Signup and view all the answers

What is the function of the zona pellucida?

To protect the ovum Signup and view all the answers

What is the purpose of acrosomal enzymes?

To break down barriers surrounding the ovum Signup and view all the answers

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.