How does the egg prevent multiple sperm from fertilizing it at the same time?
Chapter 1

The cellular blueprints of life

Chapter 2

The hormonal orchestra and anatomy

Chapter 3

The spectacular moment of conception

Chapter 4

The journey from cell to baby

YOUR GOAL

Master of The human reproductive system

Ch 3 · The spectacular moment of conception
artiteacher

artiteacher The zinc spark of fertilization

Jul 11

artiteacher

artiteacher The spectacular moment of conception

Zinc spark, zinc spark! We are glowing in the dark!

Jul 10

artiteacher

artiteacher Breaking through the egg outer armor

Jul 11

artiteacher
The zinc spark of fertilization

artiteacher The exact moment of fertilization triggers a literal flash of light from the egg.

Jul 10

artiteacher
Breaking through the egg outer armor

artiteacher A sperm must release special enzymes to dissolve the protective layers surrounding the egg.

Jul 10

artiteacher
Little Life Spark - cute, friendly, tactile.
    *   The
BETA

artiteacher Drag the friendly spark to the egg to discover how human life begins.

Jul 10

artiteacher
Fun Fact

The zinc spark: At the exact moment of fertilization, the human egg releases a tiny flash of light made of zinc.

Jul 10

artiteacher
Glossary
fertilization (noun)
The fusion of male and female gametes to form a zygote. This biological event occurs in the fallopian tube when a sperm penetrates a mature egg.

Jul 10

artiteacher
Gossip

Which fertilization step is the coolest?

Jul 10

artiteacher
Quiz

What is the protective, jelly-like outer membrane surrounding a human egg cell called?

Jul 10

artiteacher

artiteacher The chemical conversation in the fallopian tube

Jul 11

artiteacher
Quiz

What structures in the fallopian tube help sweep the fertilized egg toward the uterus?

Jul 10

artiteacher

artiteacher The journey to the uterine home

Jul 11

artiteacher
Quiz

Around which day after fertilization does the blastocyst typically implant into the uterine wall?

Jul 10

artiteacher
Quiz

What is a fertilized human egg called immediately after the sperm and egg DNA fuse?

Jul 10

artiteacher
Quiz

What is the name of the enzyme-filled cap on a sperm's head that helps it penetrate the egg?

Jul 10

artiteacher
Quiz

What remarkable event occurs at the exact millisecond of human fertilization?

Jul 10

artiteacher
Quiz

How does the egg prevent multiple sperm from fertilizing it at the same time?

Jul 10

artiteacher
Quiz

What chemical signal does a human egg release to attract sperm toward its location?

Jul 10